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调用该函数，该函数存储在字符串变量中

发布于 2024-09-28 16:37:55 字数 1182 浏览 2 评论 0原文

重复

它可能与如何动态调用类的方法在 .NET 中？

和

如何实现动态调用函数，没错，要调用的函数是由数据库值决定的，使用c#，

但是上面两个的解决方案正如答案所说的很复杂，不适合我猜是初学者。

两种解决方案都

包含“类型”，从代码中我认为它是用于定义方法所属的类。

就像

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);
    }

我最初的网站一样，只包含一个所有函数共有的类，

一个具有“函数名称”“func id”的数据库

假设：-函数名称与代码中的函数名称完全相同

我只想实现以下

根据文本框中提到的id获取函数名称的字符串值
现在调用该函数，其名称在字符串中变量

问题

中，需要“type.GetMethod(mymethod);”

原文

it may be a duplicate of

How to dynamically call a class' method in .NET?

and of

how to achieve calling a function dynamically, thats right the function to be called is decided from database values, using c#

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

and

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

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);
    }

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

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

supposed :- function name exactly same as that in code

i only want to achieve the following

get the string value of function name according to the id mentioned in the text box
now call that function, whose name is in the string variable

problem

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

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瘫痪情歌 2024-10-05 16:37:55

为了调用函数，您需要指定声明该函数的类型。如果您要调用的所有函数都在公共类上声明，您可以执行以下操作：

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);
}

如果您要调用的函数是静态的，则不需要该类型的实例：

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);
}

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);
}

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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