diff --git a/CS/MainWindow.xaml b/CS/MainWindow.xaml
index 4e1bb01..0e965ff 100644
--- a/CS/MainWindow.xaml
+++ b/CS/MainWindow.xaml
@@ -10,6 +10,9 @@
+
+
+
diff --git a/CS/MainWindow.xaml.cs b/CS/MainWindow.xaml.cs
index c13cca5..21aad52 100644
--- a/CS/MainWindow.xaml.cs
+++ b/CS/MainWindow.xaml.cs
@@ -51,15 +51,17 @@ void RaisePropertyChanged(string property) {
string IDataErrorInfo.Error {
get { return GetError(); }
}
+
string GetError() {
if (string.IsNullOrEmpty(TestString))
- return "ErrorType=Critical;ErrorContent=empty";
+ return "ErrorType=Critical;ErrorContent=The value is not provided. Please enter a value";
if (TestString.Length < 3)
- return "ErrorType=Critical;ErrorContent=error";
+ return "ErrorType=Warning;ErrorContent=The value is less than 3 characters. Please enter at least 5 characters";
if (TestString.Length < 5)
- return "ErrorType=Information;ErrorContent=warning";
+ return "ErrorType=Information;ErrorContent=The value is less than 5 characters. Please enter at least 5 characters";
return string.Empty;
}
+
string IDataErrorInfo.this[string columnName] {
get {
if (columnName == "TestString")
diff --git a/Images/validation.jpg b/Images/validation.jpg
new file mode 100644
index 0000000..9a38ef7
Binary files /dev/null and b/Images/validation.jpg differ
diff --git a/Readme.md b/Readme.md
index 368efed..1bc045d 100644
--- a/Readme.md
+++ b/Readme.md
@@ -4,25 +4,141 @@
[](https://docs.devexpress.com/GeneralInformation/403183)
[](#does-this-example-address-your-development-requirementsobjectives)
-
-*Files to look at*:
+
+# WPF Editors - Indicate Errors and Warnings by Implementing IDataErrorInfo
+
+This example validates input in a WPF [`TextEdit`](https://docs.devexpress.com/WPF/DevExpress.Xpf.Editors.TextEdit) and displays a warning if validation fails. It implements the standard `IDataErrorInfo` interface and applies a custom `ErrorControl` style to display icons (error, warning, information) along with descriptive messages to help users correct input errors.
+
+
+
+
+## Implementation Details
+
+### Create Validation Logic
+
+The data object implements the `IDataErrorInfo` interface. The `Error` property returns a formatted string that includes the error type and message:
+
+```csharp
+public class TestClass : IDataErrorInfo {
+ public string TestString { get; set; }
+
+ string IDataErrorInfo.Error {
+ get { return GetError(); }
+ }
+
+ string GetError() {
+ if (string.IsNullOrEmpty(TestString))
+ return "ErrorType=Critical;ErrorContent=The value is not provided. Please enter a value";
+ if (TestString.Length < 3)
+ return "ErrorType=Warning;ErrorContent=The value is less than 3 characters. Please enter at least 5 characters";
+ if (TestString.Length < 5)
+ return "ErrorType=Information;ErrorContent=The value is less than 5 characters. Please enter at least 5 characters";
+ return string.Empty;
+ }
+
+ string IDataErrorInfo.this[string columnName] {
+ get {
+ if (columnName == "TestString")
+ return GetError();
+ return string.Empty;
+ }
+ }
+}
+```
+
+### Parse Error Content
+
+The error string encodes multiple values (`ErrorType` and `ErrorContent`). A value converter extracts these parts and displays them in the UI:
+
+
+```csharp
+public class ErrorContentConverter : IValueConverter {
+ public string GetValueTag { get; set; }
+ public string Separator { get; set; }
+
+ public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) {
+ if (value == null || !(value is string))
+ return value;
+ string error = System.Convert.ToString(value, culture);
+ if (string.IsNullOrEmpty(error))
+ return value;
+
+ string searchString = GetValueTag + "=";
+ foreach (string suberror in error.Split(new string[] { Separator }, StringSplitOptions.RemoveEmptyEntries)) {
+ if (suberror.Contains(searchString))
+ return suberror.Replace(searchString, string.Empty);
+ }
+ return value;
+ }
+ public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) {
+ return null;
+ }
+}
+```
+
+### Apply Two Converter Modes
+
+The converter works in **Type** and **Content** modes. You can extract the `ErrorType` or the `ErrorContent` from the `IDataErrorInfo.Error` string:
+
+* **Type** mode drives an implicit `ErrorControl` style that picks the appropriate icon (Critical/Warning/Information).
+* **Content** mode feeds a custom tooltip that displays the error message next to the editor.
+
+```xaml
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+```
+
+## Files to Review
* [MainWindow.xaml](./CS/MainWindow.xaml) (VB: [MainWindow.xaml](./VB/MainWindow.xaml))
* [MainWindow.xaml.cs](./CS/MainWindow.xaml.cs) (VB: [MainWindow.xaml.vb](./VB/MainWindow.xaml.vb))
-
-# WPF Editors - Indicate errors and warnings by implementing IDataErrorInfo
+## Documentation
-Please implement the IDataErrorInfo interface on the data object. Then, pass the text and type of error in the IDataErrorInfo.Error property ( it is possible to easily parse this string). Implement a custom style for the ErrorControl. This element presents the error icon. Modify the ErrorControl style in such a way as to take into account a custom error type and text (use the converter).
-
+* [TextEdit](https://docs.devexpress.com/WPF/DevExpress.Xpf.Editors.TextEdit)
+* [EditValue](https://docs.devexpress.com/WPF/DevExpress.Xpf.Editors.BaseEdit.EditValue)
+* [ErrorToolTipContentTemplate](https://docs.devexpress.com/WPF/DevExpress.Xpf.Editors.BaseEdit.ErrorToolTipContentTemplate)
+* [ErrorContent](https://docs.devexpress.com/WPF/DevExpress.Xpf.Editors.Validation.BaseValidationError.ErrorContent)
-
+## More Examples
+* [WPF Data Editors - Create a Registration Form](https://github.com/DevExpress-Examples/wpf-data-editors-create-registration-form)
+* [WPF Data Editors - Allow Users to Enter Only Positive Numbers](https://github.com/DevExpress-Examples/wpf-editors-prevent-negative-values)
+* [WPF Data Grid - Use Custom Editors to Edit Cell Values](https://github.com/DevExpress-Examples/wpf-data-grid-use-custom-editors-to-edit-cell-values)
+* [WPF Data Grid - How to Validate Cell Editors](https://github.com/DevExpress-Examples/wpf-data-grid-validate-cell-editors)
-## Does this example address your development requirements/objectives?
-
-[
](https://www.devexpress.com/support/examples/survey.xml?utm_source=github&utm_campaign=wpf-editors-validate-user-input-indicate-errors-idataerrorinfo&~~~was_helpful=yes) [
](https://www.devexpress.com/support/examples/survey.xml?utm_source=github&utm_campaign=wpf-editors-validate-user-input-indicate-errors-idataerrorinfo&~~~was_helpful=no)
-
+## Does this example address your development requirements/objectives?
+
+[](https://www.devexpress.com/support/examples/survey.xml?utm_source=github&utm_campaign=wpf-editors-validate-user-input-indicate-errors-idataerrorinfo&~~~was_helpful=yes) [](https://www.devexpress.com/support/examples/survey.xml?utm_source=github&utm_campaign=wpf-editors-validate-user-input-indicate-errors-idataerrorinfo&~~~was_helpful=no)
+
(you will be redirected to DevExpress.com to submit your response)