編輯和更新gridview

我正在編輯和更新我的數據庫使用gridview本身。我幾乎做了一切，但我唯一的問題是，我有一個下拉列表。我很高興與標籤編輯並將其更改爲下拉列表列表編輯模式。現在我無法單獨更新下拉值到我的分貝。我得到一個名爲system.web.I值我無法得到所需的價值，我面臨的困難，因爲字面控制。我是一個新手所以請幫助我。提前感謝隊友。我的設計：編輯和更新gridview

<asp:GridView runat ="server" GridLines = "Both" DataKeyNames="book_id" 
AutoGenerateColumns ="false" CellPadding ="5" CellSpacing ="5" allowpaging="True" allowsorting="True" 
ID="gv_table1" EmptyDataText ="No data exists" OnRowEditing="gv_RowEditing" 
     PageIndex="0" PageSize="10" ToolTip="true" 
OnRowCancelingEdit="gv_RowCancelingEdit" OnRowUpdating="gv_RowUpdating" 
     OnRowDeleting="gv_RowDeleting" onpageindexchanging="gv_table1_PageIndexChanging" 
> 
<Columns> 





<asp:BoundField DataField="book_name" HeaderText="BookName"> 
<ControlStyle Width ="60" /> 
</asp:BoundField> 
<asp:BoundField DataField="author_name" HeaderText="Author Name"> 
<ControlStyle Width ="60" /> 
</asp:BoundField> 
<asp:BoundField DataField="publisher" HeaderText="Publisher"> 
<ControlStyle Width ="60" /> 
</asp:BoundField> 
<asp:BoundField DataField="year_edition" HeaderText="Year/Edition"> 
<ControlStyle Width ="60" /> 
</asp:BoundField> 
<asp:BoundField DataField="total_no" HeaderText="Total No"> 
<ControlStyle Width ="30" /> 
</asp:BoundField> 
<asp:BoundField DataField="available" HeaderText="Available"> 
<ControlStyle Width ="30" /> 
</asp:BoundField> 
<asp:BoundField DataField="tags" HeaderText="Tags"> 
<ControlStyle Width ="60" /> 
</asp:BoundField> 
<asp:BoundField DataField="fare" HeaderText="Fare"> 
<ControlStyle Width ="30" /> 
</asp:BoundField> 
<asp:TemplateField HeaderText="state"> 
          <ItemTemplate> 
           <asp:Label ID="drpstatus1" AppendDataBoundItems="True" Text='<%# Bind("state") %>' Width ="60" runat="server"> 

           </asp:Label > 

          </ItemTemplate> 
          <EditItemTemplate > 
          <asp:DropDownList ID="drpstatus" runat="server" > 
           <asp:ListItem Text="available" Value="0"></asp:ListItem> 
           <asp:ListItem Text="binding" Value="1"></asp:ListItem> 
           <asp:ListItem Text="lost" Value ="2"></asp:ListItem> 
           <asp:ListItem Text ="notavailable" Value ="3"></asp:ListItem> 
          </asp:DropDownList> 


         </EditItemTemplate> 

          </asp:TemplateField> 



<asp:TemplateField HeaderText ="Options"> 

           <itemtemplate > 

             <asp:linkbutton id="btnEdit" runat="server" commandname="Edit" text="Edit" /> 

             <asp:linkbutton id="btnDelete" runat="server" commandname="Delete" text="Delete" /> 
           </itemtemplate> 
           <edititemtemplate> 
             <asp:linkbutton id="btnUpdate" runat="server" commandname="Update" text="Update" /> 
             <asp:linkbutton id="btnCancel" runat="server" commandname="Cancel" text="Cancel" /> 
           </edititemtemplate> 
         </asp:templatefield> 





</Columns> 
</asp:GridView>

我後面的代碼：

public void setgrid() 
    { 

      gv_table1.DataSource = con.GetData("select book_id,book_name,author_name,publisher,year_edition,total_no,state ,available,tags,fare from book_info where status!='deleted'"); 
      gv_table1.DataBind(); 
       } 
    protected void gv_RowEditing(object sender, GridViewEditEventArgs e) 
    { 


     gv_table1.EditIndex = e.NewEditIndex; 

     this.setgrid(); 
     if (!IsPostBack) 
     { 
      Response.Write("not post back"); 
     } 

    } 

    protected void gv_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e) 
    { 

     gv_table1.EditIndex = -1; 

     this.setgrid(); 
    } 

    public void gv_RowUpdating(object sender, GridViewUpdateEventArgs e) 
    { 


     string totalno = (gv_table1.Rows[e.RowIndex].Cells[4].Controls[0] as TextBox).Text; 
     string available = (gv_table1.Rows[e.RowIndex].Cells[5].Controls[0] as TextBox).Text; 
     int total = Convert.ToInt32(totalno); 
     int avail = Convert.ToInt32(available); 

     if (total < avail) 
     { 
      Page page = HttpContext.Current.Handler as Page; 

      if (page != null) 
      { 

       string error = "available should not be greater than total no"; 

       ScriptManager.RegisterStartupScript(page, page.GetType(), "err_msg", "alert('" + error + "');", true); 

      } 

     } 
     else 
     { 
      int bookid = Convert.ToInt32(gv_table1.DataKeys[e.RowIndex].Values["book_id"].ToString()); 
      string bookname = ((TextBox)(gv_table1.Rows[e.RowIndex].Cells[0].Controls[0])).Text; 
      string fare = (gv_table1.Rows[e.RowIndex].Cells[7].Controls[0] as TextBox).Text; 


      string authorname = ((TextBox)(gv_table1.Rows[e.RowIndex].Cells[1].Controls[0])).Text; 
      string publisher = ((TextBox)(gv_table1.Rows[e.RowIndex].Cells[2].Controls[0])).Text; 
      string yearedition = ((TextBox)(gv_table1.Rows[e.RowIndex].Cells[3].Controls[0])).Text; 
      string tags = ((TextBox)(gv_table1.Rows[e.RowIndex].Cells[6].Controls[0])).Text; 

      string spacediv3 = Convert.ToString ((LiteralControl)(gv_table1.Rows[e.RowIndex].Cells[8].Controls[0])) ; 
      string s = spacediv3 ; 
      string status = "active"; 

      con.parameters("@bookid", DBConnection.Type.eInt, bookid); 
      con.parameters("@createduser", DBConnection.Type.eVarchar, "user"); 
      con.parameters("@status", DBConnection.Type.eVarchar, status); 
      con.parameters("@bookname", DBConnection.Type.eVarchar, bookname); 
      con.parameters("@authorname", DBConnection.Type.eVarchar, authorname); 
      con.parameters("@publisher", DBConnection.Type.eVarchar, publisher); 
      con.parameters("@yearedition", DBConnection.Type.eVarchar, yearedition); 
      con.parameters("@totalno", DBConnection.Type.eInt, totalno); 
      con.parameters("@available", DBConnection.Type.eInt, available); 
      con.parameters("@tags", DBConnection.Type.eVarchar, tags); 
      con.parameters("@fare", DBConnection.Type.eInt, fare); 
      con.parameters("@state", DBConnection.Type.eVarchar, s); 
      con.parameters("@createddate", DBConnection.Type.eDateTime, ""); 
      con.parameters("@modifieduser", DBConnection.Type.eVarchar, ""); 
      con.parameters("@modifieddate", DBConnection.Type.eDateTime, ""); 

      con.ExecProcedure("sp_books"); 
      Response.Redirect("book_add.aspx"); 
     } 
    } 

    protected void gv_RowDeleting(object sender, GridViewDeleteEventArgs e) 
    { 

     int bookid = Convert.ToInt32(gv_table1.DataKeys[e.RowIndex].Values["book_id"].ToString()); 
     string status = "deleted"; 
     con.parameters("@bookid", DBConnection.Type.eInt, bookid); 
     con.parameters("@createduser", DBConnection.Type.eVarchar, "user"); 
     con.parameters("@status", DBConnection.Type.eVarchar, status); 
     con.parameters("@bookname", DBConnection.Type.eVarchar, ""); 
     con.parameters("@authorname", DBConnection.Type.eVarchar, ""); 
     con.parameters("@publisher", DBConnection.Type.eVarchar, ""); 
     con.parameters("@yearedition", DBConnection.Type.eVarchar, ""); 
     con.parameters("@totalno", DBConnection.Type.eInt, ""); 
     con.parameters("@available", DBConnection.Type.eInt, ""); 
     con.parameters("@tags", DBConnection.Type.eVarchar, ""); 
     con.parameters("@fare", DBConnection.Type.eInt, ""); 
     con.parameters("@state", DBConnection.Type.eVarchar, ""); 
     con.parameters("@createddate", DBConnection.Type.eDateTime, ""); 
     con.parameters("@modifieduser", DBConnection.Type.eVarchar, ""); 
     con.parameters("@modifieddate", DBConnection.Type.eDateTime, ""); 

     con.ExecProcedure("sp_books"); 
     Response.Redirect("book_add.aspx"); 
    }

來源

2012-08-28 Prashanth

使用驗證器而不是回發+警報。什麼是「con」？我真的希望它不是一個靜態連接！順便說一下，你已經使用'AppendDataBoundItems'作爲'Label'。這隻適用於像ListBox或DropDownList這樣的List控件。 –

我想從下拉列表中獲取選定的值，這是我的問題。 – Prashanth

得到了答案朋友感謝tim – Prashanth

由於您的DropDownList是TemplateField內，您可以通過FindControl("ID")找到參考：

public void gv_RowUpdating(object sender, GridViewUpdateEventArgs e) 
{ 
    GridView gv = (GridView)sender; 
    GridViewRow row = gv.Rows[e.RowIndex]; 
    DropDownList ddlStatus = (DropDownList)row.FindControl("drpstatus"); 
    String selectedStatus = ddlStatus.SelectedValue;

側面說明：

使用驗證器，而不是回傳+警報。這樣可以避免不必要的回發，並且可以通過css輕鬆更改錯誤佈局。
什麼是騙局？我希望它不是一個靜態連接！ https://stackoverflow.com/a/9707060/284240
您已使用AppendDataBoundItems作爲Label。這隻適用於列表控件，如ListBox或DropDownList。

來源

2012-08-28 15:02:17

我收到錯誤作爲對象引用未設置爲對象在最後一行（即）行中的字符串selectedstatus。 – Prashanth

@Prashanth：我編輯了我的答案。只能在當前編輯的行中訪問EditItemTemplate。我編輯了我的答案，表明這實際上是在'RowUpdating'事件中。在這裏你應該可以通過GridViewRow.FindControl（「CorrectIdOfDropdown」）找到下拉列表。 –

感謝蒂姆它正在工作 – Prashanth

其他項目·需要修正，這條線：

string spacediv3 = Convert.ToString ((LiteralControl)(gv_table1.Rows[e.RowIndex].Cells[8].Controls[0])) ;

應該是：

string spacediv3 = ((LiteralControl)(gv_table1.Rows[e.RowIndex].Cells[8].Controls[0])).Text;

你必須從中獲取文本文字控制，不需要轉換爲字符串。否則，默認情況下，它會在LiteralControl上調用ToString（），它將返回「System.Web.UI.LiteralControl」。

就你提到的下拉菜單而言，我在標記中看到它，但沒有看到我能看到的任何代碼。

來源

2012-08-28 15:00:51

我已經嘗試過這一點，但得到了spacediv3的值\ r \ n「我不知道我在這裏做錯了 – Prashanth

編輯和更新gridview

回答

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