我正在尝试将对象转换为动态类型，但由于RunTimeBinder异常而转换失败 [英] I am trying to convert an Object to dynamic type but the conversion is failing with RunTimeBinder exception

问题描述

我正在尝试将Object转换为动态类型，但是由于RunTimeBinder异常而转换失败.我尝试使用在Stackoverflow答案中遇到的两种方法.

I am trying to convert an Object to dynamic type but the conversion is failing with RunTimeBinder exception. I tried using two methods that I came across in Stackoverflow answers.

代码1:

object objSum;
dynamic dynSum;
objSum = dataTableColumnChart.Compute(String.Format("Count({0})", strColumnName), "");
dynSum = Convert.ChangeType(objSum, objSum.GetType());\
Debug.Writeline(dynSum);

代码2:

dynSum=objSum;
Debug.Writeline(dynSum);

抛出的异常是这样:

A first chance exception of type 'Microsoft.CSharp.RuntimeBinder.RuntimeBinderException' occurred in Unknown Module.

请注意，在两种情况下，执行Debug语句均会引发异常.

Please note that in both cases exception is thrown when Debug statement is executed.

推荐答案

例外是:

Cannot dynamically invoke method 'Write' because it has a Conditional attribute

当您检查可能的Debug.WriteLine输入时，动态"不是其中之一. 因此，您需要将其强制转换为字符串:

And when you check possible Debug.WriteLine inputs, "dynamic" is not one of them. So you need to cast it, to string for example:

    string strForWriteLine = dynSum.ToString() as string;
    Debug.WriteLine(strForWriteLine);

希望这会有所帮助

* 关于 dynSum.ToString()作为字符串的一些细节； 当您只使用ToString()时，您仍然会得到一个动态字符串.

* A little bit detail about dynSum.ToString() as string; When you just use ToString() you still get a dynamic string.

var strForWriteLine = dynSum.ToString();

strForWriteLine的类型为 dynamic {字符串}

strForWriteLine's type is dynamic { string }

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