public void ValueRequiredErrorMessageProvider_DefaultValue()
{
// Arrange
ModelMetadata metadata = new ModelMetadata(new Mock <ModelMetadataProvider>().Object, null, null, typeof(int), "SomePropertyName");
// Act
string errorString = ModelBinderConfig.ValueRequiredErrorMessageProvider(null, metadata, "some incoming value");
// Assert
Assert.Equal("A value is required.", errorString);
}
// Called when the property setter null check failed, allows us to add our own error message to ModelState.
internal static EventHandler <ModelValidatedEventArgs> CreateNullCheckFailedHandler(ModelMetadata modelMetadata, object incomingValue)
{
return((sender, e) =>
{
ModelValidationNode validationNode = (ModelValidationNode)sender;
ModelStateDictionary modelState = e.ActionContext.ModelState;
if (modelState.IsValidField(validationNode.ModelStateKey))
{
string errorMessage = ModelBinderConfig.ValueRequiredErrorMessageProvider(e.ActionContext, modelMetadata, incomingValue);
if (errorMessage != null)
{
modelState.AddModelError(validationNode.ModelStateKey, errorMessage);
}
}
});
}