C# Type.GetMethods()用法及代碼示例

Type.GetMethods()方法用於獲取當前Type的方法。此方法的重載列表中有2種方法，如下所示：

GetMethods(BindingFlags)方法
GetMethods()方法

GetMethods(BindingFlags) Method

當在派生類中重寫時，此方法用於使用指定的綁定約束來搜索為當前Type定義的方法。

用法： public abstract System.Reflection.MethodInfo[] GetMethods (System.Reflection.BindingFlags bindingAttr);

Here, it takes a bitmask comprised of one or more BindingFlags which specify how the search is conducted or,

Zero (Default), to return an empty array.

返回值：此方法返回一個MethodInfo對象的數組，該對象表示為當前Type定義的，與指定的綁定約束匹配的所有方法；如果沒有為當前Type定義的方法，或者沒有定義的方法與綁定匹配，則返回MethodInfo類型的空數組約束。

以下示例程序旨在說明Type.GetMethods(BindingFlags)方法的用法：

示例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); 
        } 
    } 
}

輸出：

Methods of current type is as Follow: 
 Boolean Equals(System.Object)
 Int32 GetHashCode()
 System.Type GetType()
 System.String ToString()

示例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); 
        } 
    } 
}

輸出：

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() Method

此方法用於返回當前Type的所有公共方法。

用法： public System.Reflection.MethodInfo[] GetMethods ();

返回值：此方法返回一個MethodInfo對象數組，該對象表示為當前Type定義的所有公共方法；如果沒有為當前Type定義任何公共方法，則返回一個空的MethodInfo類型的數組。

以下示例程序旨在說明上述方法的用法：

示例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); 
        } 
    } 
}

輸出：

Methods of current type is as Follow: 
 Boolean Equals(System.Object)
 Int32 GetHashCode()
 System.Type GetType()
 System.String ToString()

示例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); 
        } 
    } 
}

輸出：

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()

參考：

https://docs.microsoft.com/en-us/dotnet/api/system.type.getmethods?view=netframework-4.8

相關用法

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