向动态类型添加值会导致 RuntimeBinderException

Question

我正在构建一个UITypeEditor（从属性网格启动）来编辑一个Dictionary<T,T>，其中T可以是任何标量类型（int、long、double、string 、DateTime 等）。 将要编辑的字典作为名为 innerobject 的 object 传递到控件中。我得到的类型和键值类型如下：

Type t = innerobject.GetType();
Type[] member_t = innerobject.GetType().GetGenericArguments();
if(member_t.Length !=2)
    return null;

var keyconverter = TypeDescriptor.GetConverter(member_t[0]);
var valueconverter = TypeDescriptor.GetConverter(member_t[1]);

if (null == keyconverter || null == valueconverter)
    return null;

var dic = Activator.CreateInstance(t);

dynamic dyndic = dic;

稍后当我尝试为其添加值时，我执行以下操作（s 是文本框中的一行）：

string[] str = s.Split(new char[] { ',', ' ', '\t' }, StringSplitOptions.RemoveEmptyEntries);
if (str.Length == 2)
{
    object a = keyconverter.ConvertFromString(str[0]);
    object b = valueconverter.ConvertFromString(str[1]);
    dyndic[a] = b;
}

此时抛出Microsoft.CSharp.RuntimeBinder.RuntimeBinderException。

A first chance exception of type 'Microsoft.CSharp.RuntimeBinder.RuntimeBinderException' occurred in Unknown Module.
Additional information: The best overloaded method match for 'System.Collections.Generic.Dictionary<double,double>.this[double]' has some invalid arguments. If there is a handler for this exception, the program may be safely continued.

Answer 1

您还需要 a 和 b 是动态的：

dynamic a = keyconverter.ConvertFromString(str[0]);
dynamic b = valueconverter.ConvertFromString(str[1]);
dyndic[a] = b;