C＃替换字符串

Question

I'm trying to run this code to replace a string but when I do it gives me a error saying

Error 1 A local variable named 'typeval' cannot be declared in this scope because it would give a different meaning to 'typeval', which is already used in a 'parent or current' scope to denote something else

This is the code

public static string Replace(string typeval)
{
    string newType = "";
    string typeval = "";

    if (typeval.Equals("User Service Request"))
    {
        newType = typeval.Replace("User Service Request", "incident");
    }
    else if (typeval.Equals("User Service Restoration"))
    {
        newType = typeval.Replace("User Service Restoration", "u_request");
    }

    return newType;
}

Answer 1

You have already defined typeval once . You cannot declare it again.

Remove string typeval == ""

You should also set typval.Replace to typval and not newType . Otherwise you will always return an empty string.

Finally you don't need the if statements. You could easily simplify the function to look like this.

public static string Replace(string typeval)
{
    typeval = typeval.Replace("User Service Request", "incident");
    typeval = typeval.Replace("User Service Restoration", "u_request");

    return typeval;
}

Answer 2

You have two typevals. One in the parameter and one inside the function. Rename one of them

Answer 3

您要声明一个与方法参数同名的本地变量。

Answer 4

您有两个名为“ typeval”的变量，因此出现编译错误。