我正在尝试调用InputExtensions静态类上的方法,以便为HtmlHelper
类上的方法创建重载。
所以无论如何,我仍然无法调用InputExtensions
类的方法。以下是我用来执行此操作的部分代码:
Type inputExtensions = typeof(InputExtensions);
MethodInfo methodInfo = null;
MethodInfo genericMethod = null;
switch (propertyViewingMode.ViewingLevel)
{
case 1:
methodInfo = inputExtensions.GetMethod(methodName, new Type[] { typeof(HtmlHelper<TModel>), typeof(Expression<Func<TModel, TProperty>>), typeof(Object) });
genericMethod = methodInfo.MakeGenericMethod(typeof(TModel), typeof(TProperty));
result = genericMethod.Invoke(null, new object[] { helper, expression, new { @class = "readOnly", @readonly = "read-only" } }) as MvcHtmlString;
break;
case 2:
methodInfo = inputExtensions.GetMethod(methodName, new Type[] { typeof(HtmlHelper<TModel>), typeof(Expression<Func<TModel, TProperty>>) });
genericMethod = methodInfo.MakeGenericMethod(typeof(TModel), typeof(TProperty));
result = genericMethod.Invoke(null, new object[] { helper, expression }) as MvcHtmlString;
break;
default:
result = new MvcHtmlString(String.Empty);
break;
}
问题是methodInfo
始终为null,这意味着Type.GetMethod
找不到我想要调用的方法。
更新:请注意,当我没有为GetMethod
方法提供Type[]
数组时,它会抛出一个异常,告诉我该调用是不明确的。
更新2:这是我尝试调用的方法:
TextBoxFor<TModel, TProperty>(HtmlHelper<TModel>, Expression<Func<TModel, TProperty>>, Object)
解答:
Type inputExtensions = typeof(InputExtensions);
IEnumerable<MethodInfo> methods = null;
MethodInfo genericMethod = null;
MethodInfo methodInfo = null;
switch (propertyViewingMode.ViewingLevel)
{
case 1:
methods = inputExtensions.GetMethods().Where(m => m.IsGenericMethod && m.Name.Equals(methodName))
.Where(x => x.GetParameters().Count() == 3);
methodInfo = methods.FirstOrDefault(x => x.GetParameters()[2].ParameterType.FullName == "System.Object");
if (methodInfo != null)
{
genericMethod = methodInfo.MakeGenericMethod(new[] { typeof(TModel), typeof(TProperty) });
result = genericMethod.Invoke(null, new object[] { helper, expression, new { @class = "readOnly", @readonly = "read-only" } }) as MvcHtmlString;
}
break;
case 2:
methods = inputExtensions.GetMethods().Where(m => m.IsGenericMethod && m.Name.Equals(methodName))
.Where(x => x.GetParameters().Count() == 2);
methodInfo = methods.FirstOrDefault();
if (methodInfo != null)
{
genericMethod = methodInfo.MakeGenericMethod(new[] { typeof(TModel), typeof(TProperty) });
result = genericMethod.Invoke(null, new object[] { helper, expression }) as MvcHtmlString;
}
break;
default:
result = new MvcHtmlString(String.Empty);
break;
}
答案 0 :(得分:3)
不幸的是,似乎不可能...... http://blogs.msdn.com/b/yirutang/archive/2005/09/14/466280.aspx
你唯一能做的就是用给定的名称迭代所有方法并自己分析参数类型:(
答案 1 :(得分:2)
我相信你想要:
BindingFlags.Public | BindingFlags.Static
编辑:
尝试在调试模式下迭代这些方法,直到找到您要查找的方法,然后您可以检查参数以确保它们都排成一行。
typeof(A).GetMethods().Where(m => m.IsGenericMethod);