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C# Type.GetMember()用法及代码示例


Type.GetMember()方法用于获取当前Type的指定成员。此方法的重载列表中有3种方法，如下所示：

    • GetMember(String)方法
    • GetMember(String，BindingFlags)方法
    • GetMember(String，MemberTypes，BindingFlags)方法

GetMember(String) Method

此方法搜索具有指定名称的公共成员。


用法： public System.Reflection.MemberInfo[] GetMember (string name);

Here, it takes the string containing the name of the public members to get.

返回值：此方法返回一个MemberInfo对象数组，该数组代表具有指定名称的公共成员，如果找不到，则为空数组。

异常：如果name为null，则此方法引发ArgumentNullException。

以下示例程序旨在说明上述方法的用法：

示例1:

// C# program to demonstrate the 
// Type.GetMember(String) 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(Student); 
  
        // try-catch block for handling Exception 
        try { 
  
            MemberInfo[] info = objType.GetMember("Name"); 
  
            // Display the Result 
            Console.WriteLine("Members 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); 
        } 
    } 
} 
  
// Defining class Student 
public class Student  
{ 
    public string Name = "Rahul"; 
    public string Dept = "Electrical"; 
    public int Roll = 10; 
    public static int id = 02; 
}
输出： 
Members of current type is as Follow: 
 System.String Name

示例2:对于ArgumentNullException

// C# program to demonstrate the 
// Type.GetMember(String) 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(Student); 
  
        // try-catch block for handling Exception 
        try { 
  
            MemberInfo[] info = objType.GetMember(null); 
  
            // Display the Result 
            Console.WriteLine("Members 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.WriteLine("name is null."); 
            Console.Write("Exception Thrown: "); 
            Console.Write("{0}", e.GetType(), e.Message); 
        } 
    } 
} 
  
// Defining class Student 
public class Student  
{ 
    public string Name = "Rahul"; 
    public string Dept = "Electrical"; 
    public int Roll = 10; 
    public static int id = 02; 
}
输出： 
name is null.
Exception Thrown: System.ArgumentNullException

GetMember(String, BindingFlags) Method

此方法用于使用指定的绑定约束来搜索指定的成员。

用法： public virtual System.Reflection.MemberInfo[] GetMember (string name, System.Reflection.BindingFlags bindingAttr);

参数：
name：它是包含要获取的成员名称的字符串。
bindingAttr：这是一个由一个或多个BindingFlags组成的位掩码，用于指定如何进行搜索。或零，返回一个空数组。

返回值：如果发现否则，此方法返回一个MemberInfo对象数组，该数组代表具有指定名称的公共成员，否则为空数组。

异常：如果name为null，则此方法将引发ArgumentNullException。

以下示例程序旨在说明上述方法的用法：

示例1:

// C# program to demonstrate the 
// Type.GetMember(String, BindingFlags)  
// 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(Student); 
  
        // try-catch block for handling Exception 
        try { 
  
            MemberInfo[] info = objType.GetMember("Name", 
                      BindingFlags.Public | BindingFlags.Instance); 
  
            // Display the Result 
            Console.WriteLine("Members 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.WriteLine("name is null."); 
            Console.Write("Exception Thrown: "); 
            Console.Write("{0}", e.GetType(), e.Message); 
        } 
    } 
} 
  
// Defining class Student 
public class Student 
{ 
    public string Name = "Rahul"; 
    public string Dept = "Electrical"; 
    public int Roll = 10; 
    public static int id = 02; 
}
输出： 
Members of current type is as Follow: 
 System.String Name

示例2:对于ArgumentNullException

// C# program to demonstrate the 
// Type.GetMember(String, BindingFlags) 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(Student); 
  
        // try-catch block for handling Exception 
        try { 
  
            MemberInfo[] info = objType.GetMember(null, 
                    BindingFlags.Public | BindingFlags.Instance); 
  
            // Display the Result 
            Console.WriteLine("Members 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.WriteLine("name is null."); 
            Console.Write("Exception Thrown: "); 
            Console.Write("{0}", e.GetType(), e.Message); 
        } 
    } 
} 
  
// Defining class Student 
public class Student 
{ 
    public string Name = "Rahul"; 
    public string Dept = "Electrical"; 
    public int Roll = 10; 
    public static int id = 02; 
}
输出： 
name is null.
Exception Thrown: System.ArgumentNullException

GetMember(String, MemberTypes, BindingFlags) Method

此方法用于使用指定的绑定约束来搜索指定成员类型的指定成员。

用法： public virtual System.Reflection.MemberInfo[] GetMember (string name, System.Reflection.MemberTypes type, System.Reflection.BindingFlags bindingAttr);

参数：
name：它是包含要获取的成员名称的字符串。
type：这是要搜索的值。
bindingAttr：这是一个位掩码，由一个或多个BindingFlags组成，它们指定如何进行搜索，或者指定为零以返回空数组。

返回值：如果发现否则，此方法返回一个MemberInfo对象数组，该数组代表具有指定名称的公共成员，否则为空数组。

异常：如果名称为null，则此方法引发ArgumentNullException。

以下示例程序旨在说明上述方法的用法：

示例1:

// C# program to demonstrate the 
// Type.GetMember(String, MemberTypes, 
// BindingFlags) 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(Student); 
  
        // try-catch block for handling Exception 
        try { 
  
            MemberInfo[] info = objType.GetMember("returnNull", MemberTypes.Method, 
                                      BindingFlags.Public | BindingFlags.Instance); 
  
            // Display the Result 
            Console.WriteLine("Members 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.WriteLine("name is null."); 
            Console.Write("Exception Thrown: "); 
            Console.Write("{0}", e.GetType(), e.Message); 
        } 
    } 
} 
  
// Defining class Student 
public class Student  
{ 
    public string Name = "Rahul"; 
    public string Dept = "Electrical"; 
    public int Roll = 10; 
    public static int id = 02; 
  
    public void returnNull() {} 
}
输出： 
Members of current type is as Follow: 
 Void returnNull()

示例2:对于ArgumentNullException

// C# program to demonstrate the 
// Type.GetMember(String, MemberTypes, 
// BindingFlags) 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(Student); 
  
        // try-catch block for handling Exception 
        try { 
  
            MemberInfo[] info = objType.GetMember(null, MemberTypes.Method, 
                              BindingFlags.Public | BindingFlags.Instance); 
  
            // Display the Result 
            Console.WriteLine("Members 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.WriteLine("name is null."); 
            Console.Write("Exception Thrown: "); 
            Console.Write("{0}", e.GetType(), e.Message); 
        } 
    } 
} 
  
// Defining class Student 
public class Student 
{ 
    public string Name = "Rahul"; 
    public string Dept = "Electrical"; 
    public int Roll = 10; 
    public static int id = 02; 
  
    public void returnNull() {} 
}
输出： 
name is null.
Exception Thrown: System.ArgumentNullException

参考：



相关用法


注：本文由纯净天空筛选整理自RohitPrasad3大神的英文原创作品 C# | Type.GetMember() Method。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。