判断字符串在数组中的位置

int[] yy = { 315, 316, 317 };
                for (int i = 0; i < yy.Length; i++)
                {
                    if (yy[i] == 315)
                    {
                        //i+1就是你要的结果，也就是在yy中的第一个，y[i];
                    }                }

int [] yy new int []{315,316,317};
while(true)
{
if(315==0)
{
Console.WriteLine("315的位置果然是0");
}
}

int index = Array.IndexOf(yy,"315");

int[] yy = new int[] { 315, 316, 317 };
int n = 315;
int index = Array.IndexOf(yy, n);

用indexOf直接找索引位置用循环那就有点没事找事了。。

遍历循环，然后判断相等。static void Main()
{
   int [] list = {315,316,317};
   //遍历
   for(int i = 0;i < list.Lenght;i ++)
  {
       if(list[i] == 315)
      {
          Console.Write("315在该数组中第" + (i + 1) + "个位置");
      }
  }
}

int index = Array.IndexOf(yy,"315");

我现在要做成这样,哪里有错呢，该怎么改
string syjh="";
int index=0;
for(int j=0;j<gridview2.rows.count;j++)
{
syjh=gridview2.rows[j].cells[1].text+",";}
for(int i=0;i<gridview1.rows.count;i++)
{
string jihuaID=gridview1.rows[i].cells[1].text;
int k=syjh.indexof(jihuaID)index=k+1;
}
}

后台代码：
   using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;namespace ProgramZn2.NewFolder_new
{
    public partial class xuhaobianzhi : System.Web.UI.Page
    {        ShiYanJiLuDataContext jilu = new ShiYanJiLuDataContext();
        string tem = "";
        int index = 0;        string str = "";
        protected void Page_Load(object sender, EventArgs e)
        {            bindtree();
            bindtree2();
        }
        public  void  bindtree()
        {

       this.GridView1.DataSource=from d in jilu.test_plans
                                 where d.试验单号==1
                                 orderby d.计划ID
                                 select d;
            this.GridView1.DataBind();            string syjh = "";
                       for (int j = 0; j < GridView1.Rows.Count; j++)
            {
                syjh = GridView1.Rows[j].Cells[1].Text + ",";
                str = str + syjh;
            }

        }
        public void bindtree2()
        {            this.GridView2.DataSource = from d in jilu.test_tasks
                                        where d.试验单号 == 1
                                        orderby d.试验计划号
                                        select d;
            this.GridView2.DataBind();
        }      public string  get_xuhao(object jihuaID)
        {
            if (tem == "")
            {
                index++;
                return index.ToString();            }
            else
            {                if (tem != jihuaID.ToString())
                {
                    index++;
                    tem = jihuaID.ToString();                    return index.ToString();                }                else
                {                    return index.ToString();

                }
            }        }      public string get_renwuhao(object jihuaID)
      {
          for (int i = 0; i < GridView2.Rows.Count; i++)
          {
              string jihua = GridView2.Rows[i].Cells[1].Text;              //Response.Write(str);
              Response.Write(jihua);              int k = str.IndexOf(jihua, 0);              index = k + 1;             // Response.Write(k);          }          return index.ToString();      }
    }
}
前台代码
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>

        <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False"
            Width="661px">
            <Columns>
                <asp:TemplateField HeaderText="序号">
                    <ItemTemplate>
                        <asp:Label ID="Label1" runat="server" Text='<%#get_xuhao(Eval("计划ID"))%>'></asp:Label>
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:BoundField DataField="计划ID" HeaderText="计划ID" />
                <asp:BoundField DataField="试验计划" HeaderText="试验计划" />
            </Columns>
        </asp:GridView>
        <br />
        <br />
        <br />
        <asp:GridView ID="GridView2" runat="server" AutoGenerateColumns="False"
            Width="667px">
            <Columns>
                <asp:TemplateField HeaderText="序号">
                    <ItemTemplate>
                        <asp:Label ID="Label2" runat="server" Text='<%#get_renwuhao(Eval("试验计划号"))%>'></asp:Label>
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:BoundField DataField="试验计划号" HeaderText="试验计划号" />
                <asp:BoundField DataField="实验任务" HeaderText="实验任务" />
            </Columns>
        </asp:GridView>

    </div>
    </form>
</body>
</html>
就是想实现下面的效果（但以上的代码不能实现，我想知道错在哪里了，怎么改，请各位大虾指教，非常感谢）
Gridview1显示如下序号计划ID 试验计划
1 3 ffffff
2 4 ffffff
3 5 nananana
Gridview2显示如下
序号试验计划号实验任务
1 3 jjjj
2 4 ffff
2 4 gggggg
3 5 nanan999
3 5 333

调试易

判断字符串在数组中的位置

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