只获取c＃中的最后4位数

本文介绍了只获取c＃中的最后4位数的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我有一个gridview控件...我想在这个网格视图中只显示信用卡的最后4位数...如何在c＃中创建子串？

i have a gridview control...i wanna show only last 4 digit of credit card no in this grid view...how to make substring in c#??

推荐答案

string CCNo = "0000000000000000";
string XXNo = "XXXXXXXXXXXX";
string MaskedCCNo = String.Format("{0}{1}", XXNo, CCNo.Right(4));

你也可以简化这段代码。

You could simplify this code too.

string creditNumber = "1111222233334444"; ;
        var last4 = creditNumber.Substring(creditNumber.Length - 4, 4);

参考： []

示例：

Reference:SubString[^]

Sample:

<asp:GridView ID="GridView1" AutoGenerateColumns="false" runat="server" OnRowDataBound="GridView1_RowDataBound">
       <Columns>
           <asp:BoundField DataField="credit" HeaderText="credit" />
           <asp:BoundField DataField="last4"  HeaderText="last4" />
       </Columns>
   </asp:GridView>

protected void Page_Load(object sender, EventArgs e)
       {
           if (!Page.IsPostBack)
           {

               DataTable dt = new DataTable();
               dt.Columns.Add("credit", typeof(string));
               dt.Columns.Add("last4", typeof(string));
               dt.Rows.Add("11112222333344444","" );
               dt.Rows.Add("11112222333344444" ,"");

               GridView1.DataSource = dt;
               GridView1.DataBind();
           }
       }

       protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
       {
           if (e.Row.RowType == DataControlRowType.DataRow)
           {
               string creditNumber = DataBinder.Eval(e.Row.DataItem, "credit")+"";
               var last4 = creditNumber.Substring(creditNumber.Length - 4, 4);
               e.Row.Cells[1].Text = last4;

           }
       }

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