C# |类型。GetMember()方法
原文:https://www . geesforgeks . org/c-sharp-type-get member-method/
类型。GetMember()方法用于获取当前类型的指定成员。此方法的重载列表中有 3 种方法，如下所示:
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获取成员(字符串)方法 获取成员(字符串，绑定标签)方法 GetMember(String, MemberTypes, BindingFlags) Method
获取成员(字符串)方法
此方法搜索具有指定名称的公共成员。
语法:公共系统。反射. MemberInfo[] GetMember(字符串名称)； 在这里，它需要包含公共成员名称的字符串来获取。
返回值:这个方法返回一个 MemberInfo 对象的数组，表示具有指定名称的公共成员，如果没有找到，则返回一个空数组。
异常:如果名称为空，该方法抛出 ArgumentNullException 。
以下程序说明了上述方法的使用:
例 1:
```cs // 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; } ```
Output:
```cs Members of current type is as Follow: System.String Name
```
示例 2: 适用于参数异常
```cs // 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; } ```
Output:
```cs name is null. Exception Thrown: System.ArgumentNullException
```
获取成员(字符串，绑定标签)方法
此方法用于使用指定的绑定约束搜索指定的成员。
语法:公共虚拟系统。反射。成员信息[]获取成员(字符串名称，系统。反射. binding flags binding attr)；
参数 : 名称:是包含要获取的成员名称的字符串。 bindingAttr :它是一个位掩码，由一个或多个 BindingFlags 组成，指定如何进行搜索。或者，零，返回一个空数组。
返回值:这个方法返回一个 MemberInfo 对象的数组，表示具有指定名称的公共成员，如果没有找到，则返回一个空数组。
异常:如果名称为空，该方法抛出参数为空异常。
以下程序说明了上述方法的使用:
例 1:
```cs // 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; } ```
Output:
```cs Members of current type is as Follow: System.String Name
```
示例 2: 适用于参数异常
```cs // 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; } ```
Output:
```cs name is null. Exception Thrown: System.ArgumentNullException
```
获取成员(字符串、成员类型、绑定标签)方法
此方法用于使用指定的绑定约束搜索指定成员类型的指定成员。
语法:公共虚拟系统。反射。成员信息[]获取成员(字符串名称，系统。反射。成员类型类型，系统。反射. binding flags binding attr)；
参数 : 名称:是包含要获取的成员名称的字符串。 类型:是要搜索的值。 bindingAttr :它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，或者使用 Zero 返回一个空数组。
返回值:这个方法返回一个 MemberInfo 对象的数组，表示具有指定名称的公共成员，如果没有找到，则返回一个空数组。
异常:如果名称为空，这个方法抛出 ArgumentNullException 。
以下程序说明了上述方法的使用:
例 1:
```cs // 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() {} } ```
Output:
```cs Members of current type is as Follow: Void returnNull()
```
示例 2: 适用于参数异常
```cs // 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() {} } ```
Output:
```cs name is null. Exception Thrown: System.ArgumentNullException
```
参考:
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