调用存储在字符串变量中的函数 [英] calling the function, which is stored in a string variable

问题描述

它可能是

如何在.NET中动态调用类的方法？

和

如何实现动态调用函数，即使用c＃

由数据库值确定要调用的函数的正确性，但是以上两个有解决方案，正如答案所说的那样，不是我想的初学者。

but the above two have solutions which as the answers said are complicated, not for a beginner i guess.

和

这两种解决方案包含类型，从我认为的代码中可以定义该方法所属的类。

both solutions contain "type" which from the code i think is for defining the class the method belongs to.

like

static void caller(String myclass, String mymethod)
    {
        // Get a type from the string 
        Type type = Type.GetType(myclass);
        // Create an instance of that type
        Object obj = Activator.CreateInstance(type);
        // Retrieve the method you are looking for
        MethodInfo methodInfo = type.GetMethod(mymethod);
        // Invoke the method on the instance we created above
        methodInfo.Invoke(obj, null);
    }

但是我最初的网站只包含所有功能共有的一个类，

but my initial web site, only contains one class common to all the functions,

具有函数名称 func id的数据库

a database which has "function name" "func id"

假定：-函数名称与在代码中

supposed :- function name exactly same as that in code

我只想实现以下目标

• 根据文本框中提到的ID获取函数名称的字符串值

• get the string value of function name according to the id mentioned in the text box

现在调用该函数，其名称在字符串变量中

now call that function, whose name is in the string variable

methodinfo，需要输入 type.GetMethod（mymethod ）;

the methodinfo, needs the "type.GetMethod(mymethod);"

..

推荐答案

函数，您需要指定声明此函数的类型。如果要调用的所有函数都在公共类上声明，则可以执行以下操作：

In order to call a function you need to specify the type this function is declared on. If all functions you are going to call are declared on a common class you could do the following:

static void CallFunc(string mymethod)
{
    // Get a type from the string 
    Type type = typeof(TypeThatContainsCommonFunctions);

    // Create an instance of that type
    object obj = Activator.CreateInstance(type);

    // Retrieve the method you are looking for
    MethodInfo methodInfo = type.GetMethod(mymethod);

    // Invoke the method on the instance we created above
    methodInfo.Invoke(obj, null);
}

如果要调用的函数是静态的，则不需要类型的实例：

If the functions you are going to call are static you don't need an instance of the type:

static void CallFunc(string mymethod)
{
    // Get a type from the string 
    Type type = typeof(TypeThatContainsCommonFunctions);

    // Retrieve the method you are looking for
    MethodInfo methodInfo = type.GetMethod(mymethod);

    // Invoke the method on the type
    methodInfo.Invoke(null, null);
}

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