类型。C# 中的 GetConstructors()方法及示例

原文:https://www . geesforgeks . org/type-getconstructors-method-in-c-sharp-with-examples/

类型。GetConstructors()方法用于获取 Type 对象的构造函数。该方法重载列表中有 2 种方法如下:

打字。GetConstructors()方法

此方法用于返回为当前类型定义的所有公共构造函数。 语法:

public System.Reflection.ConstructorInfo[] GetConstructors ();

返回:该方法返回 ConstructorInfo 数组对象，表示为当前类型定义的所有公共实例构造函数，但不包括类型初始值设定项(静态构造函数)。 以下程序说明了型的使用。GetConstructors() 方法: 示例 1:

c sharp . c sharp . c sharp . c sharp

// C# program to demonstrate the
// Type.GetConstructors() Method
using System;
using System.Globalization;
using System.Reflection;

class GFG {

    // Main Method
    public static void Main()
    {
        // Declaring and initializing object
        object obj = new Object();

        // Getting the type of object
        // using GetType() method
        Type type = obj.GetType();

        // Getting constructors of the current Type.
        // using GetArrayRank() Method
        ConstructorInfo[] info = type.GetConstructors();

        // Display all the public instance constructors
        Console.WriteLine("All constructors are shown below");

        for (int i = 0; i < info.Length; i++)
            Console.WriteLine(info[i]);
    }
}

Output: 

All constructors are shown below
Void .ctor()

例 2:

c sharp . c sharp . c sharp . c sharp

// C# program to demonstrate the
// Type.GetConstructors() Method
using System;
using System.Globalization;
using System.Reflection;

class GFG {

    // Main Method
    public static void Main()
    {
        // Declaring and initializing Type object
        Type type = typeof(string);

        // Getting constructors of the current Type.
        // using GetConstructors() Method
        ConstructorInfo[] info = type.GetConstructors();

        // Display all the public instance constructors
        Console.WriteLine("All constructors are shown below");

        for (int i = 0; i < info.Length; i++)
            Console.WriteLine(info[i]);
    }
}

Output: 

All constructors are shown below
Void .ctor(Char[])
Void .ctor(Char[], Int32, Int32)
Void .ctor(Char*)
Void .ctor(Char*, Int32, Int32)
Void .ctor(SByte*)
Void .ctor(SByte*, Int32, Int32)
Void .ctor(SByte*, Int32, Int32, Encoding)
Void .ctor(Char, Int32)
Void .ctor(ReadOnlySpan`1)

打字。方法

此方法用于返回为当前类型定义的构造函数，当在派生类中被重写时，使用指定的 BindingFlags， 语法:

公共抽象系统。反射. ConstructorInfo[]GetConstructors(系统。反射. binding flags binding attr)；

这里，它采用了一个由一个或多个绑定标志组成的位掩码，这些标志指定了参加的时间点。或零，返回空值。 以下是一些绑定标签过滤器标志，可用于定义搜索中包括哪些构造函数:

  • 您必须指定绑定标签。实例或装订标签。静态为了得到回报。
  • 指定绑定标签。公共在搜索中包含公共构造函数。
  • 指定绑定标签。非公共在搜索中包含非公共构造函数(即私有、内部和受保护的构造函数)。不返回基类的构造函数。

返回值:这个方法返回一个 ConstructorInfo 对象的数组，表示为当前类型定义的所有符合指定绑定约束的构造函数，包括类型初始值设定项(如果定义的话)。 以下程序说明了上述方法的使用: 例 1:

c sharp . c sharp . c sharp . c sharp

// C# program to demonstrate the
// Type.GetConstructors(BindingFlags)
// Method
using System;
using System.Globalization;
using System.Reflection;

class GFG {

    // Main Method
    public static void Main()
    {
        // Declaring and initializing Type object
        Type type = typeof(string);

        // Declaring and initializing BindingFlags
        // it is used to specify how the search
        // is conducted
        BindingFlags bf = BindingFlags.Public
                          | BindingFlags.Static
                          | BindingFlags.NonPublic
                          | BindingFlags.Instance;

        // Getting constructors of the current Type.
        // using GetConstructors() Method
        ConstructorInfo[] info = type.GetConstructors(bf);

        // Display all constructors
        Console.WriteLine("All constructors are shown below");

        for (int i = 0; i < info.Length; i++)
            Console.WriteLine(info[i]);
    }
}

Output: 

All constructors are shown below
Void .ctor(Char[])
Void .ctor(Char[], Int32, Int32)
Void .ctor(Char*)
Void .ctor(Char*, Int32, Int32)
Void .ctor(SByte*)
Void .ctor(SByte*, Int32, Int32)
Void .ctor(SByte*, Int32, Int32, Encoding)
Void .ctor(Char, Int32)
Void .ctor(ReadOnlySpan`1)

例 2:

c sharp . c sharp . c sharp . c sharp

// C# program to demonstrate the
// Type.GetConstructors(BindingFlags)
// Method
using System;
using System.Globalization;
using System.Reflection;

class GFG {

    // Main Method
    public static void Main()
    {
        // Creating and initializing object
        object obj = new Object();

        // Declaring and initializing Type object
        Type type = obj.GetType();

        // Declaring and initializing BindingFlags
        // it is used to specify how the search is conducted
        BindingFlags bf = BindingFlags.Public
                          | BindingFlags.Static
                          | BindingFlags.NonPublic
                          | BindingFlags.Instance;

        // Getting constructors of the current Type.
        // using GetConstructors() Method
        ConstructorInfo[] info = type.GetConstructors(bf);

        // Display all constructors
        Console.WriteLine("All constructors are shown below");

        for (int i = 0; i < info.Length; i++)
            Console.WriteLine(info[i]);
    }
}

Output: 

All constructors are shown below
Void .ctor()

参考:

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