调用C＃方法与参数数据 [英] Calling C# method with parameters from data

问题描述

我说，我有一个这样的XML字符串，

Say, I have an XML String like this,

<METHOD>foo</METHOD>
<PARAM1>abc</PARAM1>
<PARAM2>def</PARAM2>
...
<PARAM99>ghi</PARAM99>
<PARAM100>jkl</PARAM100>

和我有一个方法

void foo(String param1, String param2, ..., String param99, String param100)
{
...
}

有没有我这个字符串映射到相匹配的方法的参数名称PARAMS一个真正的方法调用任何简单的方法？C＃

Is there any easy way for me to map this string to a real method call with the params matching the param names of the method in C#?

推荐答案

假设你知道类型，有它的一个实例，并且该方法实际上是公开：

Assuming you know the type, have an instance of it, and that the method is actually public:

string methodName = parent.Element("METHOD").Value;
MethodInfo method = type.GetMethod(methodName);

object[] arguments = (from p in method.GetParameters()
                      let arg = element.Element(p.Name)
                      where arg != null
                      select (object) arg.Value).ToArray();

// We ignore extra parameters in the XML, but we need all the right
// ones from the method
if (arguments.Length != method.GetParameters().Length)
{
    throw new ArgumentException("Parameters didn't match");
}

method.Invoke(instance, arguments);

请注意，我做区分大小写的名称匹配在这里，它不会与你的样品工作。如果你想不区分大小写，这是稍硬，但还是可行的 - 我个人建议你使XML匹配，如果在所有可能的方法。

Note that I'm doing case-sensitive name matching here, which wouldn't work with your sample. If you want to be case-insensitive it's slightly harder, but still doable - personally I'd advise you to make the XML match the method if at all possible.

（如果是非公您需要提供一些绑定标志来调用<​​code> GetMethod ）

(If it's non-public you need to provide some binding flags to the call to GetMethod.)

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