C# Type.GetProperties()用法及代碼示例

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

GetProperties()方法
GetProperties(BindingFlags)方法

GetProperties() Method

此方法用於返回當前Type的所有公共屬性。

用法： public System.Reflection.PropertyInfo[] GetProperties ();

返回值：此方法返回代表當前Type的所有公共屬性的PropertyInfo對象的數組，或者如果當前Type沒有公共屬性，則返回一個PropertyInfo類型的空數組。

以下示例程序旨在說明Type.GetProperties()方法的使用：

示例1:

// C# program to demonstrate the 
// Type.GetProperties() 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(string); 
  
        // try-catch block for handling Exception 
        try { 
  
            // using GetProperties() Method 
            PropertyInfo[] type = objType.GetProperties(); 
  
            // Display the Result 
            Console.WriteLine("Properties of current type is: "); 
            for (int i = 0; i < type.Length; i++) 
                Console.WriteLine(" {0}", type[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：

Properties of current type is: 
 Int32 Length
 Char Chars [Int32]

示例2:

// C# program to demonstrate the 
// Type.GetProperties() 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(System.Type); 
  
        // try-catch block for handling Exception 
        try { 
  
            // using GetProperties() Method 
            PropertyInfo[] type = objType.GetProperties(); 
  
            // Display the Result 
            Console.WriteLine("Properties of current type is: "); 
            for (int i = 0; i < 10; i++) 
                Console.WriteLine(" {0}", type[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：

Properties of current type is: 
 System.Reflection.MemberTypes MemberType
 System.Type DeclaringType
 System.Reflection.MethodBase DeclaringMethod
 System.Type ReflectedType
 System.Runtime.InteropServices.StructLayoutAttribute StructLayoutAttribute
 System.Guid GUID
 System.Reflection.Binder DefaultBinder
 System.Reflection.Module Module
 System.Reflection.Assembly Assembly
 System.RuntimeTypeHandle TypeHandle

GetProperties(BindingFlags) Method

此方法用於在派生類中重寫時使用指定的綁定約束來搜索當前Type的屬性。

用法： public abstract System.Reflection.PropertyInfo[] GetProperties (System.Reflection.BindingFlags bindingAttr);

Here, it takes a bitmask comprised of one or more BindingFlags that specify how the search is conducted or Zero, to return null.

返回值：如果當前Type不具有屬性，或者如果沒有屬性與綁定約束相匹配，則此方法返回一個PropertyInfo對象數組，該對象表示與指定綁定約束匹配的當前Type的所有屬性，或者返回一個PropertyInfo類型的空數組。

示例1:

// C# program to demonstrate the 
// Type.GetProperties(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(Dog); 
  
        // using GetProperties() Method 
        PropertyInfo[] type = objType.GetProperties(BindingFlags.Instance | BindingFlags.Public); 
  
        // Display the Result 
        Console.WriteLine("Properties of current type is: "); 
        for (int i = 0; i < type.Length; i++) 
            Console.WriteLine(" {0}", type[i]); 
    } 
} 
  
// Defining class Dog 
public class Dog { 
  
    private string color, breed, type; 
  
    // Constructor 
    public Dog(string color, string breed, string type) 
    { 
        this.color = color; 
        this.breed = breed; 
        this.type = type; 
    } 
  
    // Color Property 
    public String Color 
    { 
        get { return color; } 
    } 
  
    // Breed Property 
    public String Breed 
    { 
        get { return breed; } 
    } 
  
    // Type Property 
    public String Type 
    { 
        get { return type; } 
    } 
  
    // BloodGroup Property 
    private String BloodGroup 
    { 
        get { return "AB+"; } 
    } 
}

輸出：

Properties of current type is: 
 System.String Color
 System.String Breed
 System.String Type

示例2:

// C# program to demonstrate the 
// Type.GetProperties(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(Dog); 
  
        // using GetProperties() Method 
        PropertyInfo[] type = objType.GetProperties(BindingFlags.Instance | BindingFlags.NonPublic); 
  
        // Display the Result 
        Console.WriteLine("Properties of current type is: "); 
        for (int i = 0; i < type.Length; i++) 
            Console.WriteLine(" {0}", type[i]); 
    } 
} 
  
// Defining class Dog 
public class Dog { 
  
    private string color, breed, type, bp; 
  
    // Constructor 
    public Dog(string color, string breed, 
                   string type, string bp) 
    { 
        this.color = color; 
        this.breed = breed; 
        this.type = type; 
        this.bp = bp; 
    } 
  
    // Color Property 
    public String Color 
    { 
        get { return color; } 
    } 
  
    // Breed Property 
    public String Breed 
    { 
        get { return breed; } 
    } 
  
    // Type Property 
    public String Type 
    { 
        get { return type; } 
    } 
  
    // BloodGroup Property 
    protected String BloodGroup 
    { 
        get { return "AB+"; } 
    } 
  
    // BloodPressure Property 
    protected String BloodPressure 
    { 
        get { return bp; } 
    } 
}

輸出：

Properties of current type is: 
 System.String BloodGroup
 System.String BloodPressure

參考：

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

相關用法

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