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Allow bind Enum values in IAutoInitialize ViewModels #1916

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Allow bind Enum values in IAutoInitialize ViewModels #1916

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97da753
included tests for each function changed + considered enum name or va…
candidodmv Sep 30, 2019
a04ae60
Allow bind Enum values in IAutoInitialize ViewModels
candidodmv Aug 29, 2019
085ff46
Update ParametersExtensions.cs
candidodmv Sep 1, 2019
05697ec
force to use only enum name
candidodmv Sep 1, 2019
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70 changes: 70 additions & 0 deletions Source/Prism.Tests/Mvvm/AutoInitializeViewModelFixture.cs
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Original file line number Diff line number Diff line change
@@ -0,0 +1,70 @@
using System.Collections.Generic;
using System.Linq;
using Prism.Common;
using Xunit;

namespace Prism.Tests.Mvvm
{
internal class MockParameters : ParametersBase
{
public MockParameters() : base() { }
public MockParameters(string query) : base(query) { }
}

internal enum MockEnum
{
None = 0,
Foo = 1,
Bar = 2,
Fizz = 3
}
Comment on lines +8 to +20
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each type should be in its own file. Also mocks belong under the Mocks namespace


public class AutoInitializeViewModelFixture
{
[Fact]
public void TryGetValueOfT()
{
var parameters = new MockParameters("mock=Foo&mock2=1");
bool success = false;
MockEnum value = default;
MockEnum value1 = default;

var ex = Record.Exception(() => success = parameters.TryGetValue<MockEnum>("mock", out value));
var ex2 = Record.Exception(() => success = parameters.TryGetValue<MockEnum>("mock2", out value1));
Assert.Null(ex);
Assert.True(success);
Assert.Equal(MockEnum.Foo, value);
Assert.Equal(value, value1);
}

[Fact]
public void GetValuesOfT()
{
var parameters = new MockParameters("mock=Foo&mock=2&mock=Fizz");
bool success = false;
IEnumerable<MockEnum> values = default;

var ex = Record.Exception(() => values = parameters.GetValues<MockEnum>("mock"));
Assert.Null(ex);
Assert.Equal(3, values.Count());
Assert.Equal(MockEnum.Foo, values.ElementAt(0));
Assert.Equal(MockEnum.Bar, values.ElementAt(1));
Assert.Equal(MockEnum.Fizz, values.ElementAt(2));
}


[Fact]
public void GetValue()
{
var parameters = new MockParameters("mock=Foo&mock1=2&mock2=Fizz");
MockEnum value = default;
MockEnum value1 = default;

var ex = Record.Exception(() => value = parameters.GetValue<MockEnum>("mock"));
var ex2 = Record.Exception(() => value1 = parameters.GetValue<MockEnum>("mock1"));
Assert.Null(ex);
Assert.Equal(MockEnum.Foo, value);
Assert.Equal(MockEnum.Bar, value1);
}
}
}
21 changes: 15 additions & 6 deletions Source/Prism/Common/ParametersExtensions.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -25,6 +25,8 @@ public static object GetValue(this IEnumerable<KeyValuePair<string, object>> par
return kvp.Value;
else if (type.IsAssignableFrom(kvp.Value.GetType()))
return kvp.Value;
else if (type.IsEnum && Enum.IsDefined(type, kvp.Value.ToString()))
return Enum.Parse(type, kvp.Value.ToString());
else
return Convert.ChangeType(kvp.Value, type);
}
Expand All @@ -36,18 +38,22 @@ public static object GetValue(this IEnumerable<KeyValuePair<string, object>> par
[EditorBrowsable(EditorBrowsableState.Never)]
public static bool TryGetValue<T>(this IEnumerable<KeyValuePair<string, object>> parameters, string key, out T value)
{
var type = typeof(T);

foreach (var kvp in parameters)
{
if (string.Compare(kvp.Key, key, StringComparison.Ordinal) == 0)
{
if (kvp.Value == null)
value = default;
else if (kvp.Value.GetType() == typeof(T))
else if (kvp.Value.GetType() == type)
value = (T)kvp.Value;
else if (typeof(T).IsAssignableFrom(kvp.Value.GetType()))
else if (type.IsAssignableFrom(kvp.Value.GetType()))
value = (T)kvp.Value;
else if (type.IsEnum && Enum.IsDefined(type, kvp.Value.ToString()))
value = (T)Enum.Parse(type, kvp.Value.ToString());
else
value = (T)Convert.ChangeType(kvp.Value, typeof(T));
value = (T)Convert.ChangeType(kvp.Value, type);

return true;
}
Expand All @@ -61,19 +67,22 @@ public static bool TryGetValue<T>(this IEnumerable<KeyValuePair<string, object>>
public static IEnumerable<T> GetValues<T>(this IEnumerable<KeyValuePair<string, object>> parameters, string key)
{
List<T> values = new List<T>();
var type = typeof(T);

foreach (var kvp in parameters)
{
if (string.Compare(kvp.Key, key, StringComparison.Ordinal) == 0)
{
if (kvp.Value == null)
values.Add(default);
else if (kvp.Value.GetType() == typeof(T))
else if (kvp.Value.GetType() == type)
values.Add((T)kvp.Value);
else if (typeof(T).IsAssignableFrom(kvp.Value.GetType()))
else if (type.IsAssignableFrom(kvp.Value.GetType()))
values.Add((T)kvp.Value);
else if (type.IsEnum && Enum.IsDefined(type, kvp.Value.ToString()))
values.Add((T)Enum.Parse(type, kvp.Value.ToString()));
else
values.Add((T)Convert.ChangeType(kvp.Value, typeof(T)));
values.Add((T)Convert.ChangeType(kvp.Value, type));
}
}

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