/
Contract.xml
1764 lines (1661 loc) · 117 KB
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Contract.xml
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<Type Name="Contract" FullName="System.Diagnostics.Contracts.Contract">
<TypeSignature Language="C#" Value="public static class Contract" />
<TypeSignature Language="ILAsm" Value=".class public auto ansi abstract sealed beforefieldinit Contract extends System.Object" />
<TypeSignature Language="DocId" Value="T:System.Diagnostics.Contracts.Contract" />
<TypeSignature Language="VB.NET" Value="Public Class Contract" />
<TypeSignature Language="F#" Value="type Contract = class" />
<TypeSignature Language="C++ CLI" Value="public ref class Contract abstract sealed" />
<AssemblyInfo>
<AssemblyName>System.Diagnostics.Contracts</AssemblyName>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.3.0</AssemblyVersion>
<AssemblyVersion>4.0.4.0</AssemblyVersion>
<AssemblyVersion>5.0.0.0</AssemblyVersion>
<AssemblyVersion>6.0.0.0</AssemblyVersion>
<AssemblyVersion>7.0.0.0</AssemblyVersion>
<AssemblyVersion>8.0.0.0</AssemblyVersion>
<AssemblyVersion>9.0.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>mscorlib</AssemblyName>
<AssemblyVersion>2.0.5.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>netstandard</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.1.0.0</AssemblyVersion>
</AssemblyInfo>
<TypeForwardingChain>
<TypeForwarding From="mscorlib" FromVersion="4.0.0.0" To="System.Diagnostics.Contracts" ToVersion="0.0.0.0" FrameworkAlternate="dotnet-uwp-10.0" />
<TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.Diagnostics.Contracts" ToVersion="5.0.0.0" FrameworkAlternate="net-5.0" />
<TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.Diagnostics.Contracts" ToVersion="6.0.0.0" FrameworkAlternate="net-6.0" />
<TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.Diagnostics.Contracts" ToVersion="7.0.0.0" FrameworkAlternate="net-7.0" />
<TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.Diagnostics.Contracts" ToVersion="8.0.0.0" FrameworkAlternate="net-8.0" />
<TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.Diagnostics.Contracts" ToVersion="9.0.0.0" FrameworkAlternate="net-9.0" />
</TypeForwardingChain>
<Base>
<BaseTypeName>System.Object</BaseTypeName>
</Base>
<Interfaces />
<Attributes>
<Attribute FrameworkAlternate="net-8.0;net-9.0">
<AttributeName Language="C#">[System.Runtime.CompilerServices.Nullable(0)]</AttributeName>
<AttributeName Language="F#">[<System.Runtime.CompilerServices.Nullable(0)>]</AttributeName>
</Attribute>
<Attribute FrameworkAlternate="net-8.0;net-9.0">
<AttributeName Language="C#">[System.Runtime.CompilerServices.NullableContext(1)]</AttributeName>
<AttributeName Language="F#">[<System.Runtime.CompilerServices.NullableContext(1)>]</AttributeName>
</Attribute>
</Attributes>
<Docs>
<summary>Contains static methods for representing program contracts such as preconditions, postconditions, and object invariants.</summary>
<remarks>
<format type="text/markdown"><.
For tools and detailed instructions for using code contracts, see [Code Contracts](https://marketplace.visualstudio.com/items?itemName=RiSEResearchinSoftwareEngineering.CodeContractsforNET) on the Visual Studio Marketplace.
> [!IMPORTANT]
> You must use a binary rewriter to insert run-time enforcement of contracts. Otherwise, contracts such as the <xref:System.Diagnostics.Contracts.Contract.Ensures%2A?displayProperty=nameWithType> method can only be tested statically and will not throw exceptions during run time if a contract is violated. You can download the binary rewriter CCRewrite from [Code Contracts](https://marketplace.visualstudio.com/items?itemName=RiSEResearchinSoftwareEngineering.CodeContractsforNET) on the Visual Studio Marketplace. CCRewrite comes with a Visual Studio add-in that enables you to activate run-time contract enforcement from the project **Properties** page. The binary rewriter and the Visual Studio add-in do not ship with Visual Studio 2010 or the Windows SDK.
]]></format>
</remarks>
</Docs>
<Members>
<MemberGroup MemberName="Assert">
<AssemblyInfo>
<AssemblyName>System.Diagnostics.Contracts</AssemblyName>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.3.0</AssemblyVersion>
</AssemblyInfo>
<Docs>
<summary>In debug builds, performs a run-time test for a specified condition.</summary>
</Docs>
</MemberGroup>
<Member MemberName="Assert">
<MemberSignature Language="C#" Value="public static void Assert (bool condition);" />
<MemberSignature Language="ILAsm" Value=".method public static hidebysig void Assert(bool condition) cil managed" />
<MemberSignature Language="DocId" Value="M:System.Diagnostics.Contracts.Contract.Assert(System.Boolean)" />
<MemberSignature Language="VB.NET" Value="Public Shared Sub Assert (condition As Boolean)" />
<MemberSignature Language="F#" Value="static member Assert : bool -> unit" Usage="System.Diagnostics.Contracts.Contract.Assert condition" />
<MemberSignature Language="C++ CLI" Value="public:
 static void Assert(bool condition);" />
<MemberType>Method</MemberType>
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<AssemblyName>System.Diagnostics.Contracts</AssemblyName>
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<AssemblyName>mscorlib</AssemblyName>
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<AssemblyVersion>2.1.0.0</AssemblyVersion>
</AssemblyInfo>
<Attributes>
<Attribute>
<AttributeName Language="C#">[System.Diagnostics.Conditional("CONTRACTS_FULL")]</AttributeName>
<AttributeName Language="F#">[<System.Diagnostics.Conditional("CONTRACTS_FULL")>]</AttributeName>
</Attribute>
<Attribute>
<AttributeName Language="C#">[System.Diagnostics.Conditional("DEBUG")]</AttributeName>
<AttributeName Language="F#">[<System.Diagnostics.Conditional("DEBUG")>]</AttributeName>
</Attribute>
<Attribute FrameworkAlternate="netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1">
<AttributeName Language="C#">[System.Runtime.ConstrainedExecution.ReliabilityContract(System.Runtime.ConstrainedExecution.Consistency.WillNotCorruptState, System.Runtime.ConstrainedExecution.Cer.MayFail)]</AttributeName>
<AttributeName Language="F#">[<System.Runtime.ConstrainedExecution.ReliabilityContract(System.Runtime.ConstrainedExecution.Consistency.WillNotCorruptState, System.Runtime.ConstrainedExecution.Cer.MayFail)>]</AttributeName>
</Attribute>
</Attributes>
<ReturnValue>
<ReturnType>System.Void</ReturnType>
</ReturnValue>
<Parameters>
<Parameter Name="condition" Type="System.Boolean">
<Attributes>
<Attribute FrameworkAlternate="net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-3.0;netcore-3.1;netstandard-2.1">
<AttributeName Language="C#">[System.Diagnostics.CodeAnalysis.DoesNotReturnIf(false)]</AttributeName>
<AttributeName Language="F#">[<System.Diagnostics.CodeAnalysis.DoesNotReturnIf(false)>]</AttributeName>
</Attribute>
</Attributes>
</Parameter>
</Parameters>
<Docs>
<param name="condition">The conditional expression to test.</param>
<summary>Checks for a condition; if the condition is <see langword="false" />, follows the escalation policy set for the analyzer.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
The default escalation policy is to notify the attached debugger about a contract failure or to display an **Assert** dialog box if a debugger is not attached. Optionally, the analyzer can be instructed to throw an exception.
]]></format>
</remarks>
</Docs>
</Member>
<Member MemberName="Assert">
<MemberSignature Language="C#" Value="public static void Assert (bool condition, string userMessage);" FrameworkAlternate="dotnet-uwp-10.0;netcore-1.0;netcore-1.1;netcore-2.0;netcore-2.1;netcore-2.2;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
<MemberSignature Language="ILAsm" Value=".method public static hidebysig void Assert(bool condition, string userMessage) cil managed" />
<MemberSignature Language="DocId" Value="M:System.Diagnostics.Contracts.Contract.Assert(System.Boolean,System.String)" />
<MemberSignature Language="VB.NET" Value="Public Shared Sub Assert (condition As Boolean, userMessage As String)" />
<MemberSignature Language="F#" Value="static member Assert : bool * string -> unit" Usage="System.Diagnostics.Contracts.Contract.Assert (condition, userMessage)" />
<MemberSignature Language="C++ CLI" Value="public:
 static void Assert(bool condition, System::String ^ userMessage);" />
<MemberSignature Language="C#" Value="public static void Assert (bool condition, string? userMessage);" FrameworkAlternate="net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-3.0;netcore-3.1" />
<MemberType>Method</MemberType>
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<AssemblyName>System.Diagnostics.Contracts</AssemblyName>
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<AssemblyVersion>7.0.0.0</AssemblyVersion>
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<AssemblyVersion>2.1.0.0</AssemblyVersion>
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<Attributes>
<Attribute>
<AttributeName Language="C#">[System.Diagnostics.Conditional("DEBUG")]</AttributeName>
<AttributeName Language="F#">[<System.Diagnostics.Conditional("DEBUG")>]</AttributeName>
</Attribute>
<Attribute>
<AttributeName Language="C#">[System.Diagnostics.Conditional("CONTRACTS_FULL")]</AttributeName>
<AttributeName Language="F#">[<System.Diagnostics.Conditional("CONTRACTS_FULL")>]</AttributeName>
</Attribute>
<Attribute FrameworkAlternate="net-8.0;net-9.0">
<AttributeName Language="C#">[System.Runtime.CompilerServices.NullableContext(2)]</AttributeName>
<AttributeName Language="F#">[<System.Runtime.CompilerServices.NullableContext(2)>]</AttributeName>
</Attribute>
<Attribute FrameworkAlternate="netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1">
<AttributeName Language="C#">[System.Runtime.ConstrainedExecution.ReliabilityContract(System.Runtime.ConstrainedExecution.Consistency.WillNotCorruptState, System.Runtime.ConstrainedExecution.Cer.MayFail)]</AttributeName>
<AttributeName Language="F#">[<System.Runtime.ConstrainedExecution.ReliabilityContract(System.Runtime.ConstrainedExecution.Consistency.WillNotCorruptState, System.Runtime.ConstrainedExecution.Cer.MayFail)>]</AttributeName>
</Attribute>
</Attributes>
<ReturnValue>
<ReturnType>System.Void</ReturnType>
</ReturnValue>
<Parameters>
<Parameter Name="condition" Type="System.Boolean">
<Attributes>
<Attribute FrameworkAlternate="net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-3.0;netcore-3.1;netstandard-2.1">
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</Attribute>
</Attributes>
</Parameter>
<Parameter Name="userMessage" Type="System.String" />
</Parameters>
<Docs>
<param name="condition">The conditional expression to test.</param>
<param name="userMessage">A message to display if the condition is not met.</param>
<summary>Checks for a condition; if the condition is <see langword="false" />, follows the escalation policy set by the analyzer and displays the specified message.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
The default escalation policy is to notify the attached debugger about a contract failure or to display an **Assert** dialog box if a debugger is not attached. Optionally, the analyzer can be instructed to throw an exception. The `userMessage` parameter is passed to the debugger output. If `userMessage` is not a constant string literal, tools may not be able to read it.
]]></format>
</remarks>
</Docs>
</Member>
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<summary>Instructs code analysis tools to assume that a condition is <see langword="true" />, even if it cannot be statically proven to always be <see langword="true" />.</summary>
</Docs>
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<AttributeName Language="C#">[System.Runtime.ConstrainedExecution.ReliabilityContract(System.Runtime.ConstrainedExecution.Consistency.WillNotCorruptState, System.Runtime.ConstrainedExecution.Cer.MayFail)]</AttributeName>
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<ReturnType>System.Void</ReturnType>
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<Parameter Name="condition" Type="System.Boolean">
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<param name="condition">The conditional expression to assume <see langword="true" />.</param>
<summary>Instructs code analysis tools to assume that the specified condition is <see langword="true" />, even if it cannot be statically proven to always be <see langword="true" />.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
At run time, using this method is equivalent to using the <xref:System.Diagnostics.Contracts.Contract.Assert%28System.Boolean%29> method.
]]></format>
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<Parameter Name="condition" Type="System.Boolean">
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<Attribute FrameworkAlternate="net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-3.0;netcore-3.1;netstandard-2.1">
<AttributeName Language="C#">[System.Diagnostics.CodeAnalysis.DoesNotReturnIf(false)]</AttributeName>
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<Parameter Name="userMessage" Type="System.String" />
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<param name="condition">The conditional expression to assume <see langword="true" />.</param>
<param name="userMessage">The message to post if the assumption fails.</param>
<summary>Instructs code analysis tools to assume that a condition is <see langword="true" />, even if it cannot be statically proven to always be <see langword="true" />, and displays a message if the assumption fails.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
If `userMessage` is not a constant string literal, the contract may not be understood by tools.
At run time, using this method is equivalent to using the <xref:System.Diagnostics.Contracts.Contract.Assert%28System.Boolean%2CSystem.String%29> method.
]]></format>
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<AttributeName Language="C#">[add: System.Security.SecurityCritical]</AttributeName>
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<AttributeName Language="C#">[remove: System.Security.SecurityCritical]</AttributeName>
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<summary>Occurs when a contract fails.</summary>
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<format type="text/markdown"><![CDATA[
## Remarks
The event information for this event is supplied by the <xref:System.Diagnostics.Contracts.ContractFailedEventArgs?displayProperty=nameWithType> object that is passed to the event handler. This event notifies a managed application environment such as an interactive interpreter or a Web browser host that a contract has failed. Before doing so, it will raise an event that an application can handle as it sees fit. For example, if code is being run in a testing framework, you can log a test failure and then end the test.
The default implementation of the <xref:System.Diagnostics.Contracts.Internal.ContractHelper.RaiseContractFailedEvent%2A> method in the .NET Framework class library is to call each handler that is registered with the <xref:System.Diagnostics.Contracts.Contract.ContractFailed> event. Exceptions thrown by handlers are ignored, but each handler can indicate whether the failure is handled by calling the <xref:System.Diagnostics.Contracts.ContractFailedEventArgs.SetHandled%2A> method for the event arguments. If any handler sets the failure as handled, the method returns `null` and no further action is taken. Alternatively, handlers can call the <xref:System.Diagnostics.Contracts.ContractFailedEventArgs.SetUnwind%2A> method to instruct the code to unwind. In that case, an exception is thrown after all handlers have executed.
]]></format>
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<Attribute FrameworkAlternate="netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1">
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<summary>Marks the end of the contract section when a method's contracts contain only preconditions in the <see langword="if" />-<see langword="then" />-<see langword="throw" /> form.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
Most code already contains some parameter validation in the form of `if`-`then`-`throw` code. The contract tools recognize `if`-`then`-`throw` statements as preconditions when the statements appear first inside a method, and the entire set of such statements is followed by an explicit <xref:System.Diagnostics.Contracts.Contract> method call, such as a <xref:System.Diagnostics.Contracts.Contract.Requires%2A>, <xref:System.Diagnostics.Contracts.Contract.Ensures%2A>, <xref:System.Diagnostics.Contracts.Contract.EnsuresOnThrow%2A>, or <xref:System.Diagnostics.Contracts.Contract.EndContractBlock%2A>.
When `if`-`then`-`throw` statements appear in this form, the contract tools recognize them as legacy-require statements. The <xref:System.Diagnostics.Contracts.Contract.EndContractBlock%2A> form is used only if no other contracts follow the `if`-`then`-`throw` sequences, but they should still be tagged as legacy-requires.
]]></format>
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<summary>Specifies a postcondition contract for the enclosing method or property.</summary>
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<param name="condition">The conditional expression to test. The expression may include <see cref="M:System.Diagnostics.Contracts.Contract.OldValue``1(``0)" />, <see cref="M:System.Diagnostics.Contracts.Contract.ValueAtReturn``1(``0@)" />, and <see cref="M:System.Diagnostics.Contracts.Contract.Result``1" /> values.</param>
<summary>Specifies a postcondition contract for the enclosing method or property.</summary>
<remarks>
<format type="text/markdown">< on the Visual Studio Marketplace) for run-time enforcement of this postcondition.
## Examples
The following example shows how to use the <xref:System.Diagnostics.Contracts.Contract.Ensures%2A> method to ensure that an expected value is returned. This code example is part of a larger example provided for the <xref:System.Diagnostics.Contracts.ContractClassAttribute> class.
:::code language="csharp" source="~/snippets/csharp/System.Diagnostics.Contracts/Contract/Ensures/program.cs" id="Snippet3":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR/contractexample/vb/program.vb" id="Snippet3":::
]]></format>
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<Parameter Name="userMessage" Type="System.String" />
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<Docs>
<param name="condition">The conditional expression to test. The expression may include <see cref="M:System.Diagnostics.Contracts.Contract.OldValue``1(``0)" /> and <see cref="M:System.Diagnostics.Contracts.Contract.Result``1" /> values.</param>
<param name="userMessage">The message to display if the expression is not <see langword="true" />.</param>
<summary>Specifies a postcondition contract for a provided exit condition and a message to display if the condition is <see langword="false" />.</summary>
<remarks>
<format type="text/markdown">< on the Visual Studio Marketplace) for run-time enforcement of this postcondition.
- If `userMessage` is not a constant string literal, the contract may not be understood by tools.
]]></format>
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<summary>Specifies a postcondition contract for the enclosing method or property based on the provided exception and condition.</summary>
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<typeparam name="TException">The type of exception that invokes the postcondition check.</typeparam>
<param name="condition">The conditional expression to test.</param>
<summary>Specifies a postcondition contract for the enclosing method or property, based on the provided exception and condition.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
The `condition` parameter specifies a postcondition that is expected to be `true` when the enclosing method or property terminates abnormally and an exception of type `TException` is thrown.
- This method call must be at the beginning of a method or property, before any other code.
- This contract is exposed to clients; therefore, it must only reference members that are at least as visible as the enclosing method.
- You must use the binary rewriter for run-time enforcement of this postcondition.
]]></format>
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<typeparam name="TException">The type of exception that invokes the postcondition check.</typeparam>
<param name="condition">The conditional expression to test.</param>
<param name="userMessage">The message to display if the expression is <see langword="false" />.</param>
<summary>Specifies a postcondition contract and a message to display if the condition is <see langword="false" /> for the enclosing method or property, based on the provided exception and condition.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
The `condition` parameter specifies a postcondition that is expected to be `true` when the enclosing method or property terminates abnormally and an exception of type `TException` is thrown. The `message` parameter specifies a message to display if the condition is `false`.
- This method call must be at the beginning of a method or property, before any other code.
- This contract is exposed to clients; therefore, it must only reference members that are at least as visible as the enclosing method.
- You must use the binary rewriter for run-time enforcement of this postcondition.
- If `userMessage` is not a constant string literal, the contract may not be understood by tools.
]]></format>
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<param name="fromInclusive">The first integer to pass to <paramref name="predicate" />.</param>
<param name="toExclusive">One more than the last integer to pass to <paramref name="predicate" />.</param>
<param name="predicate">The function to evaluate for any value of the integer in the specified range.</param>
<summary>Determines whether a specified test is true for any integer within a range of integers.</summary>
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<see langword="true" /> if <paramref name="predicate" /> returns <see langword="true" /> for any integer starting from <paramref name="fromInclusive" /> to <paramref name="toExclusive" /> - 1.</returns>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
The `toExclusive` parameter is one more than the last integer to facilitate using the length of a range of integers starting at 0. For example, it would be set to 5 for integers 0 through 4.
]]></format>
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<paramref name="predicate" /> is <see langword="null" />.</exception>
<exception cref="T:System.ArgumentException">
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<typeparam name="T">The type that is contained in <paramref name="collection" />.</typeparam>
<param name="collection">The collection from which elements of type <c>T</c> will be drawn to pass to <paramref name="predicate" />.</param>
<param name="predicate">The function to evaluate for an element in <paramref name="collection" />.</param>
<summary>Determines whether an element within a collection of elements exists within a function.</summary>
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<see langword="true" /> if and only if <paramref name="predicate" /> returns <see langword="true" /> for any element of type <paramref name="T" /> in <paramref name="collection" />.</returns>
<remarks>To be added.</remarks>
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<paramref name="collection" /> or <paramref name="predicate" /> is <see langword="null" />.</exception>
<altmember cref="M:System.Collections.Generic.List`1.Exists(System.Predicate{`0})" />
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