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TypeConverter.IsValid Method (Object)

 

Returns whether the given value object is valid for this type.

Namespace:   System.ComponentModel
Assembly:  System (in System.dll)

member IsValid : 
        value:Object -> bool

Parameters

value
Type: System.Object

The object to test for validity.

Return Value

Type: System.Boolean

true if the specified value is valid for this object; otherwise, false.

Starting in .NET Framework 4, the IsValid method catches exceptions from the CanConvertFrom and ConvertFrom methods. If the input value type causes CanConvertFrom to return false, or if the input value causes ConvertFrom to raise an exception, the IsValid method returns false.

To enable the legacy behavior, insert the following lines into the configuration file of the application, for example, application1.exe.config.

<configuration>
  <appSettings>
    <add key="UseCompatibleTypeConverterBehavior" value="true" />
  </appSettings>
</configuration>

Notes to Inheritors:

Override this method if the type you want to convert supports standard values that can be validated.

The IsValid method is used to validate a value within the type rather than to determine if value can be converted to the given type. For example, IsValid can be used to determine if a given value is valid for an enumeration type. For an example, see EnumConverter.

You can write your own WillConvertSucceed method by wrapping the ConvertTo and ConvertFrom methods in exception blocks.

.NET Framework
Available since 1.1
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