PropertyInfo.SetValue ArgumentException？

Question

我有以下代码。但是，它在SetValue上有一个运行时异常。什么可能导致错误？

var _filter = new Filter(....); // Filter implemented IFilter
ApplyFilter(_view.Name, x => x.Name); 

private void ApplyFilter<T>(T curr, Expression<Func<IFilter, T>> prev) 
{
    var expr = (MemberExpression)prev.Body;
    var prop = (PropertyInfo)expr.Member;
    if (!EqualityComparer<T>.Default.Equals(curr, (T)_filter[prop.Name]))
    {
        prop.SetValue(_filter, curr, null); // Error
        ..... // do something on _filter

例外是：

System.ArgumentException was unhandled
  Message=Property set method not found.
  Source=mscorlib
  StackTrace:
       at System.Reflection.RuntimePropertyInfo.SetValue(Object obj, Object value, BindingFlags invokeAttr, Binder binder, Object[] index, CultureInfo culture)
       at System.Reflection.RuntimePropertyInfo.SetValue(Object obj, Object value, Object[] index)
       at MyApp.ErrorLogPresenter.ApplyFilter[T](T curr, Expression`1 prev) in d:\....cs:line 50

Answer 1

Message=Property set method not found.

这通常只是意味着您使用的属性未定义setter 。确保存在合适的setter，或使用不同的方法来分配值。