PropertyInfo.GetIndexParameters 方法

定義

命名空間:

System.Reflection

組件:

netstandard.dll, System.Runtime.dll

來源:

PropertyInfo.cs

當在衍生類別中覆寫時，傳回屬性的所有索引參數的陣列。

C#

public abstract System.Reflection.ParameterInfo[] GetIndexParameters();

傳回

ParameterInfo[]

ParameterInfo 類型的陣列，包含索引的參數。 如果此屬性未建立索引，則表示陣列有 0 (零) 個項目。

範例

下列範例會顯示指定之屬性的索引參數。

C#

using System;
using System.Reflection;

// A class that contains some properties.
public class MyProperty
{
    // Define a simple string property.
    private string caption = "A Default caption";
    public string Caption
    {
        get{return caption;}
        set {if(caption!=value) {caption = value;}
        }
    }

    // A very limited indexer that gets or sets one of four
    // strings.
    private string[] strings = {"abc", "def", "ghi", "jkl"};
    public string this[int Index]
    {
        get
        {
            return strings[Index];
        }
        set
        {
            strings[Index] = value;
        }
    }
}

class Mypropertyinfo
{
    public static int Main()
    {
        // Get the type and PropertyInfo.
        Type t = Type.GetType("MyProperty");
        PropertyInfo pi = t.GetProperty("Caption");

        // Get the public GetIndexParameters method.
        ParameterInfo[] parms = pi.GetIndexParameters();
        Console.WriteLine("\r\n" + t.FullName + "." + pi.Name
            + " has " + parms.GetLength(0) + " parameters.");

        // Display a property that has parameters. The default
        // name of an indexer is "Item".
        pi = t.GetProperty("Item");
        parms = pi.GetIndexParameters();
        Console.WriteLine(t.FullName + "." + pi.Name + " has " +
            parms.GetLength(0) + " parameters.");
        foreach( ParameterInfo p in parms )
        {
            Console.WriteLine("   Parameter: " + p.Name);
        }

        return 0;
    }
}
/*
 This example produces the following output:
 MyProperty.Caption has 0 parameters.
 MyProperty.Item has 1 parameters.
    Parameter: Index
 */

備註

從傳回的陣列擷取任何必要的參數資訊。

若要使用 GetIndexParameters 方法，請先取得 類別 Type。 從取得 TypePropertyInfo。 從使用 PropertyInfoGetIndexParameters 方法。

適用於