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Format error message validation attribute

This method appends the name of the data field that triggered the error to the formatted error message. You can customize how the error message is formatted. Within the attribute we have overridden the FormatErrorMEssage method, like so: public override string FormatErrorMessage( string name) { return String. Format( CultureInfo. CurrentCulture, ErrorMessage, name, _ types. Instead of ( or perhaps in conjunction with) using the [ DisplayName] attribute, use the [ Display] attribute in System. Populate its Name property. With that, you can use built- in validation. I didn' t find a suitable answer to my question,. So I ended up by building a simple attribute that inherit the RequiredAttribute and override the FormatErrorMessage method public sealed class FormattedRequiredAttribute. A custom validation attribute lets you create metadata that you can use in the data model to validate data fields. Optionally, override the FormatErrorMessage method to perform custom error- message formatting.

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  • Video:Error validation message

    Attribute error message

    The values are passed in from each validation attribute' s FormatErrorMessage attribute. For example, using. public override string FormatErrorMessage( string name) { EnsureLegalLengths( ) ; string format = ( ( this. Additionally, you can still use the field name / display name for the property within the error message. can use additional String Format values to render the values and options that are used in the more complex validation attributes, such as. Instead of returning ValidationResult with a predefined string, try using the ErrorMessage property, or any other custom properties. For example: private const string DefaultFileNotFoundMessage = " Sorry but there is already. You can use formatting in the strings defined in your resources. When you use { 0}, as shown in FieldRequired, the display name will be inserted when possible. Otherwise it will fall back to the property name as shown for. So I looked at the source code and I see why it' s confusing. The ValidationAttribute class maintains a private _ defaultErrorMessage field of its own. When I call base( errorMessage) it forwards my string as a lambda to the.