我如何在此处访问接口方法。

问题描述

我想在我的应用程序中实现接口概念，所以我尝试了下面的一些东西，但它出错了



接口

I would like to implement the Interface concept in my application , So ijust tried some thing like below but its going something wrong

Interface

interface Grid
{
    DataTable Gridbind(string FromDate, string ToDate);

}

实施班级

Implementation Class

public class GridImplementationClass : Admin_PerformanceIncentive, Grid
{
   
    public DataTable Gridbind(string FromDate,string ToDate)
    {
        SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["constring"].ConnectionString);

        using (SqlCommand cmd = new SqlCommand("Incentive_Sp", con))
        {
            con.Open();
            cmd.CommandType = CommandType.StoredProcedure;
            cmd.Parameters.AddWithValue("@FromDate", FromDate.ToString());
            cmd.Parameters.AddWithValue("@ToDate", FromDate.ToString());
            cmd.Parameters.AddWithValue("@type", 2);
            SqlDataAdapter da = new SqlDataAdapter(cmd);
            DataTable  dt= new DataTable();
            da.Fill(dt);

            con.Close();
            return dt;
           
        }
       
    }

}

另一个班级

Another Class

public partial class Admin_PerformanceIncentive : System.Web.UI.Page
{
    GridImplementationClass obj = new GridImplementationClass();//Something wrong here.
 protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        { 
           
            DataTable dt = new DataTable();
         dt= obj.Gridbind(FromDate.ToShortDateString(), Todate.ToShortDateString());
        
        }
    }
}

GridImplementationClass obj = new GridImplementationClass（）

在 obj 中它显示NULL并且在调试时它不会移动到下一行。

它在同一时间闪烁在我点击F10的时候

如何解决？

GridImplementationClass obj = new GridImplementationClass()
In obj it shows NULL and it doesn't move to next line while debugging.
Its blink on the same line while i hit F10
How to fix it?

推荐答案

public class GridImplementationClass : AdminPerformanceIncentive, IGrid
{
   // explicit interface implementation will help you
   // to hide implementation from the user of
   // the class reference, you will need to use only
   // the interface reference,
   // to improve discipline of your code:
   DataTable IGrid.Gridbind(string FromDate, string ToDate) { /* ... */ } 
   // ...
}

// ...

GridImplementationClass @object = new GridImplementationClass();
// it's very likely that you never need to use this object,
// it seems so because of the name of your class "...Implementation";

IGrid grid = @object; // works, according to general rules
                      // of assignment compatibility
                      // for derived types
// or, better, directly IGrid grid = new GridImplementationClass();

// ...

DataTable dataTable = grid.Gridbind(/* ... */);

你明白了吗？

-SA

public class GridImplementationClass : Admin_PerformanceIncentive
{
    public static DataTable Gridbind(string FromDate, string ToDate)
    {
        // your existing code
    }
}

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        DataTable dt = GridImplementationClass.Gridbind(FromDate.ToShortDateString(), Todate.ToShortDateString());
    }
}

无需实例化GridImplementationClass类即可使用Gridbind方法。

No need to instantiate the GridImplementationClass class to use the Gridbind method.

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