C# |类型。GetMethods()方法
原文:https://www . geesforgeks . org/c-sharp-type-getmethods-method/
类型。GetMethods()方法用于获取当前类型的方法。此方法的重载列表中有 2 种方法，如下所示:
-
方法 *GetMethods() Method
方法
当在派生类中被重写时，使用指定的绑定约束，此方法用于搜索为当前类型定义的方法。
语法:公共抽象系统。反射。方法信息[]获取方法(系统。反射. binding flags binding attr)； 这里，需要一个由一个或多个 BindingFlags 组成的位掩码来返回一个空数组，binding flags 指定如何进行搜索，或者 Zero(默认值)。
返回值:此方法返回 MethodInfo 对象的数组，表示为当前类型定义的符合指定绑定约束的所有方法，或者返回 MethodInfo 类型的空数组，如果没有为当前类型定义方法，或者没有定义的方法符合绑定约束。
以下程序说明了类型的使用。GetMethods(BindingFlags) 方法:
例 1:
```cs // 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); } } } ```
Output:
```cs Methods of current type is as Follow: Boolean Equals(System.Object) Int32 GetHashCode() System.Type GetType() System.String ToString()
```
例 2:
```cs // 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); } } } ```
Output:
```cs 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类型的所有公共方法。
语法:公共系统。反射. method info[]GetMethods()；
返回值:此方法返回 MethodInfo 对象的数组，表示为当前类型定义的所有公共方法，如果没有为当前类型定义公共方法，则返回 MethodInfo 类型的空数组。
以下程序说明了上述方法的使用:
例 1:
```cs // 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); } } } ```
Output:
```cs Methods of current type is as Follow: Boolean Equals(System.Object) Int32 GetHashCode() System.Type GetType() System.String ToString()
```
例 2:
```cs // 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); } } } ```
Output:
```cs 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:
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