///
/// Removes the ModelState entry corresponding to the specified property on the model if no validation errors exist.
/// Call this when changing Model values on the server after a postback,
/// to prevent ModelState entries from taking precedence.
///
public static void RemoveStateFor(this HtmlHelper helper,
Expression> expression)
{
//First get the expected name value. This is equivalent to helper.NameFor(expression)
string name = ExpressionHelper.GetExpressionText(expression);
string fullHtmlFieldName = helper.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldName(name);
//Now check whether modelstate errors exist for this input control
ModelState modelState;
if (!helper.ViewData.ModelState.TryGetValue(fullHtmlFieldName, out modelState) ||
modelState.Errors.Count == 0)
{
//Only remove ModelState value if no modelstate error exists,
//so the ModelState will not be used over the Model
helper.ViewData.ModelState.Remove(name);
}
}
然后我们在调用MVC扩展之前创建自己的HTML Helper扩展:
public static MvcHtmlString TextBoxForModel(this HtmlHelper htmlHelper,
Expression> expression,
string format = "",
Dictionary htmlAttributes = null)
{
RemoveStateFor(htmlHelper, expression);
return htmlHelper.TextBoxFor(expression, format, htmlAttributes);
}
public static IHtmlString HiddenForModel(this HtmlHelper htmlHelper,
Expression> expression)
{
RemoveStateFor(htmlHelper, expression);
return htmlHelper.HiddenFor(expression);
}
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