📜  C#| Type.GetMethods()方法

📅  最后修改于: 2021-05-29 23:16:08             🧑  作者: Mango

Type.GetMethods()方法用于获取当前Type的方法。此方法的重载列表中有2种方法,如下所示:

  • GetMethods(BindingFlags)方法
  • GetMethods()方法

GetMethods(BindingFlags)方法

当在派生类中重写时,此方法用于使用指定的绑定约束来搜索为当前Type定义的方法。

下面的程序说明了Type.GetMethods(BindingFlags)方法的用法:

范例1:

// C# program to demonstrate the
// Type.GetMethods() Method
using System;
using System.Globalization;
using System.Reflection;
  
// Defining class Empty
public class Empty { }
  
class GFG {
  
    // Main Method
    public static void Main()
    {
        // Declaring and initializing object of Type
        Type objType = typeof(Empty);
  
        // try-catch block for handling Exception
        try {
  
            // Getting array of Method by
            // using GetMethods() Method
            MethodInfo[] info = objType.GetMethods(BindingFlags.Public | BindingFlags.Instance);
  
            // Display the Result
            Console.WriteLine("Methods of current type is as Follow: ");
            for (int i = 0; i < info.Length; i++)
                Console.WriteLine(" {0}", info[i]);
        }
  
        // catch ArgumentNullException here
        catch (ArgumentNullException e)
        {
            Console.Write("name is null.");
            Console.Write("Exception Thrown: ");
            Console.Write("{0}", e.GetType(), e.Message);
        }
    }
}
输出:
Methods of current type is as Follow: 
 Boolean Equals(System.Object)
 Int32 GetHashCode()
 System.Type GetType()
 System.String ToString()

范例2:

// C# program to demonstrate the
// Type.GetMethods() Method
using System;
using System.Globalization;
using System.Reflection;
  
class GFG {
  
    // Main Method
    public static void Main()
    {
        // Declaring and initializing object of Type
        Type objType = typeof(int);
  
        // try-catch block for handling Exception
        try {
  
            // Getting array of Method by
            // using GetMethods() Method
            MethodInfo[] info = objType.GetMethods(BindingFlags.Public | BindingFlags.Static);
  
            // Display the Result
            Console.WriteLine("Methods of current type is as Follow: ");
            for (int i = 0; i < info.Length; i++)
                Console.WriteLine(" {0}", info[i]);
        }
  
        // catch ArgumentNullException here
        catch (ArgumentNullException e) 
        {
            Console.Write("name is null.");
            Console.Write("Exception Thrown: ");
            Console.Write("{0}", e.GetType(), e.Message);
        }
    }
}
输出:
Methods of current type is as Follow: 
 Int32 Parse(System.String)
 Int32 Parse(System.String, System.Globalization.NumberStyles)
 Int32 Parse(System.String, System.IFormatProvider)
 Int32 Parse(System.String, System.Globalization.NumberStyles, System.IFormatProvider)
 Boolean TryParse(System.String, Int32 ByRef)
 Boolean TryParse(System.String, System.Globalization.NumberStyles, System.IFormatProvider, Int32 ByRef)

GetMethods()方法

此方法用于返回当前Type的所有公共方法。

下面的程序说明了上述方法的用法:

范例1:

// C# program to demonstrate the
// Type.GetMethods() Method
using System;
using System.Globalization;
using System.Reflection;
  
// Defining class Empty
class Empty { }
  
class GFG {
  
    // Main Method
    public static void Main()
    {
        // Declaring and initializing object of Type
        Type objType = typeof(Empty);
  
        // try-catch block for handling Exception
        try {
  
            // Getting array of Method by
            // using GetMethods() Method
            MethodInfo[] info = objType.GetMethods();
  
            // Display the Result
            Console.WriteLine("Methods of current type is as Follow: ");
            for (int i = 0; i < info.Length; i++)
                Console.WriteLine(" {0}", info[i]);
        }
  
        // catch ArgumentNullException here
        catch (ArgumentNullException e) 
        {
            Console.Write("name is null.");
            Console.Write("Exception Thrown: ");
            Console.Write("{0}", e.GetType(), e.Message);
        }
    }
}
输出:
Methods of current type is as Follow: 
 Boolean Equals(System.Object)
 Int32 GetHashCode()
 System.Type GetType()
 System.String ToString()

范例2:

// C# program to demonstrate the
// Type.GetMethods() Method
using System;
using System.Globalization;
using System.Reflection;
  
// Defining class Student
public class Student {
  
    private string name, dept;
    private int roll;
  
    // Constructor
    public Student(string name, int roll, string dept)
    {
        this.name = name;
        this.roll = roll;
        this.dept = dept;
    }
  
    // getter for name
    public string getName()
    {
        return name;
    }
  
    // getter for roll
    public int getRoll()
    {
        return roll;
    }
  
    // getter for dept
    public string getDept()
    {
        return dept;
    }
}
  
class GFG {
  
    // Main Method
    public static void Main()
    {
        // Declaring and initializing object of Type
        Type objType = typeof(Student);
  
        // try-catch block for handling Exception
        try {
  
            // Getting array of Method by
            // using GetMethods() Method
            MethodInfo[] info = objType.GetMethods(BindingFlags.Public | BindingFlags.Instance);
  
            // Display the Result
            Console.WriteLine("Methods of current type is as Follow: ");
            for (int i = 0; i < info.Length; i++)
                Console.WriteLine(" {0}", info[i]);
        }
  
        // catch ArgumentNullException here
        catch (ArgumentNullException e)
        {
            Console.Write("name is null.");
            Console.Write("Exception Thrown: ");
            Console.Write("{0}", e.GetType(), e.Message);
        }
    }
}
输出:
Methods of current type is as Follow: 
 System.String getName()
 Int32 getRoll()
 System.String getDept()
 Boolean Equals(System.Object)
 Int32 GetHashCode()
 System.Type GetType()
 System.String ToString()

参考:

  • https://docs.microsoft.com/zh-cn/dotnet/api/system.type.getmethods?view=netframework-4.8