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ValidationError Class

Represents the base class for all validation errors.


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

public sealed class ValidationError

The ValidationError type exposes the following members.

Public methodValidationError(String, Int32)Initializes a new instance of the ValidationError class; initializes the error text and error numbers for this instance.
Public methodValidationError(String, Int32, Boolean)Initializes a new instance of the ValidationError class, initializes the error text, error number and error type for this instance.
Public methodValidationError(String, Int32, Boolean, String)Initializes a new instance of the ValidationError class, initializing the error text, the error number, the error type and the property name associated with the error.

Public propertyErrorNumberGets the error number of this instance.
Public propertyErrorTextGets the error text for this instance.
Public propertyIsWarningGets a value that indicates whether this instance is a warning.
Public propertyPropertyNameGets or sets the name of the property that failed to validate.
Public propertyUserDataGets an IDictionary for the definition and storage of user-defined data related to this instance.

Public methodEquals(Object)Determines whether the specified object is equal to the current object. (Inherited from Object.)
Public methodGetHashCodeServes as the default hash function. (Inherited from Object.)
Public methodStatic memberGetNotSetValidationErrorCreates a new validation error defined for the error type of a property not being set.
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodToStringProvides a string representation of this instance incorporating the error type (error or warning) the error number and the error text. (Overrides Object.ToString().)


This material discusses types and namespaces that are obsolete. For more information, see Deprecated Types in Windows Workflow Foundation 4.5.

The following example shows how to create and manipulate validation errors as part of a custom validation routine.

This code example is part of the Send Mail SDK Sample and is from the SendEMailActivity.cs file. For more information, see Send Mail Activity.

private void ValidateEmailProperties(ValidationErrorCollection validationErrors, SendEmailActivity activity)
    // Validate the To property 
    if (String.IsNullOrEmpty(activity.To))

    else if (!activity.To.Contains("@"))
        validationErrors.Add(new ValidationError("Invalid To e-mail address", InvalidToAddress, false, SendEmailActivity.ToProperty.Name));


    // Validate the From property 
    if (String.IsNullOrEmpty(activity.From))
    else if (!activity.From.Contains("@"))
        validationErrors.Add(new ValidationError("Invalid From e-mail address", InvalidFromAddress, false, SendEmailActivity.FromProperty.Name));


.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
© 2015 Microsoft