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我一直在爲我的網站編寫gridview一天左右的時間，但根本無法讓它工作，解決一個問題只是創建更多的問題。ASP.NET在通過GridView更新記錄時，該記錄的內容被刪除，爲什麼？
在特定記錄上選擇編輯時，gridview進入編輯項目模板，因爲它應該，但是一旦我改變了記錄我想改變，我點擊更新，然後一旦gridview返回到項目模板，記錄中的所有字段都是空的？
這裏是GridView控件代碼：
<asp:GridView ID="GridView1" runat="server" AllowPaging="True"
AutoGenerateColumns="False" DataKeyNames="PlantID"
DataSourceID="SqlDataSource1" AllowSorting="True" CellPadding="4"
ForeColor="#333333" GridLines="None" OnRowCancelingEdit="GridView1_RowCancelingEdit"
OnRowEditing="GridView1_RowEditing" OnRowUpdating="GridView1_RowUpdating">
<AlternatingRowStyle BackColor="White" />
<Columns>
<asp:CommandField ButtonType="Button" ShowEditButton="true" />
<asp:CommandField ButtonType="Button" ShowDeleteButton="true" />
<asp:CommandField ButtonType="Button" ShowCancelButton="true" />
<asp:CommandField ButtonType="Button" ShowSelectButton="True" />
<asp:BoundField DataField="PlantID" HeaderText="PlantID" InsertVisible="False"
ReadOnly="True" SortExpression="PlantID" />
<asp:TemplateField HeaderText="Latin Name">
<ItemTemplate>
<%# Eval("LatinName") %>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox runat="server" ID="txtLatinName" Text='<%# Eval("LatinName") %>' />
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Popular Name">
<ItemTemplate>
<%# Eval("PopularName") %>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox runat="server" ID="txtPopularName" Text='<%# Eval("PopularName")%>' />
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Season">
<ItemTemplate>
<%# Eval("Season") %>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox runat="server" ID="txtSeason" Text='<%# Eval("Season") %>' />
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Aftercare">
<ItemTemplate>
<%# Eval("Aftercare") %>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox runat="server" ID="txtAftercare" Text='<%# Eval("Aftercare") %>' />
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Categories">
<ItemTemplate>
<%# Eval("Categories") %>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox runat="server" ID="txtCategories" Text='<%# Eval("Categories") %>' />
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Description">
<ItemTemplate>
<%# Eval("Description") %>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox runat="server" ID="txtDescription" Text='<%# Eval("Description") %>' />
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Uses">
<ItemTemplate>
<%# Eval("Uses") %>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox runat="server" ID="txtUses" Text='<%# Eval("Uses") %>' />
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="FoliageColour">
<ItemTemplate>
<%# Eval("FoliageColour") %>
</ItemTemplate>
<EditItemTemplate>
<asp:Textbox runat="server" ID="txtFoliageColour" Text='<%# Eval("FoliageColour") %>' />
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Flower Colour">
<ItemTemplate>
<%# Eval("FlowerColour") %>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox runat="server" ID="txtFlowerColour" Text='<%# Eval("FlowerColour") %>' />
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="FloweringPeriod">
<ItemTemplate>
<%# Eval("FloweringPeriod") %>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox runat="server" ID="txtFloweringPeriod" Text='<%# Eval("FloweringPeriod") %>' />
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Height">
<ItemTemplate>
<%# Eval("Height") %>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox runat="server" ID="txtHeight" Text='<%# Eval("Height") %>' />
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Spread">
<ItemTemplate>
<%# Eval("Spread") %>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox runat="server" ID="txtSpread" Text='<%# Eval("Spread") %>' />
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Instructions">
<ItemTemplate>
<%# Eval("Instructions") %>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox runat="server" ID="txtInstructions" Text='<%# Eval("Instructions") %>' />
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Price">
<ItemTemplate>
<%# Eval("Price") %>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox runat="server" ID="txtPrice" Text='<%# Eval("Price") %>' />
</EditItemTemplate>
</asp:TemplateField>
</Columns>
<EditRowStyle BackColor="#2461BF" />
<FooterStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
<HeaderStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
<PagerStyle BackColor="#2461BF" ForeColor="White" HorizontalAlign="Center" />
<RowStyle BackColor="#EFF3FB" />
<SelectedRowStyle BackColor="#D1DDF1" Font-Bold="True" ForeColor="#333333" />
<SortedAscendingCellStyle BackColor="#F5F7FB" />
<SortedAscendingHeaderStyle BackColor="#6D95E1" />
<SortedDescendingCellStyle BackColor="#E9EBEF" />
<SortedDescendingHeaderStyle BackColor="#4870BE" />
</asp:GridView>
<asp:SqlDataSource ID="SqlDataSource1" runat="server"
ConnectionString="<%$ ConnectionStrings:ConnectionString %>"
ProviderName="<%$ ConnectionStrings:ConnectionString.ProviderName %>"
SelectCommand="SELECT * FROM [Plants]"
DeleteCommand="DELETE FROM [Plants] WHERE [PlantID] = ?"
InsertCommand="INSERT INTO [Plants] ([PlantID], [LatinName], [PopularName], [Season], [Aftercare], [Categories], [Description], [Uses], [FoliageColour], [FlowerColour], [FloweringPeriod], [Height], [Spread], [Instructions], [Price]) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)"
UpdateCommand="UPDATE [Plants] SET [LatinName] = ?, [PopularName] = ?, [Season] = ?, [Aftercare] = ?, [Categories] = ?, [Description] = ?, [Uses] = ?, [FoliageColour] = ?, [FlowerColour] = ?, [FloweringPeriod] = ?, [Height] = ?, [Spread] = ?, [Instructions] = ?, [Price] = ? WHERE [PlantID] = ?">
<DeleteParameters>
<asp:Parameter Name="PlantID" Type="Int32" />
</DeleteParameters>
<InsertParameters>
<asp:Parameter Name="PlantID" Type="Int32" />
<asp:Parameter Name="LatinName" Type="String" />
<asp:Parameter Name="PopularName" Type="String" />
<asp:Parameter Name="Season" Type="String" />
<asp:Parameter Name="Aftercare" Type="String" />
<asp:Parameter Name="Categories" Type="String" />
<asp:Parameter Name="Description" Type="String" />
<asp:Parameter Name="Uses" Type="String" />
<asp:Parameter Name="FoliageColour" Type="String" />
<asp:Parameter Name="FlowerColour" Type="String" />
<asp:Parameter Name="FloweringPeriod" Type="String" />
<asp:Parameter Name="Height" Type="String" />
<asp:Parameter Name="Spread" Type="String" />
<asp:Parameter Name="Instructions" Type="String" />
<asp:Parameter Name="Price" Type="Decimal" />
</InsertParameters>
<UpdateParameters>
<asp:Parameter Name="LatinName" Type="String" />
<asp:Parameter Name="PopularName" Type="String" />
<asp:Parameter Name="Season" Type="String" />
<asp:Parameter Name="Aftercare" Type="String" />
<asp:Parameter Name="Categories" Type="String" />
<asp:Parameter Name="Description" Type="String" />
<asp:Parameter Name="Uses" Type="String" />
<asp:Parameter Name="FoliageColour" Type="String" />
<asp:Parameter Name="FlowerColour" Type="String" />
<asp:Parameter Name="FloweringPeriod" Type="String" />
<asp:Parameter Name="Height" Type="String" />
<asp:Parameter Name="Spread" Type="String" />
<asp:Parameter Name="Instructions" Type="String" />
<asp:Parameter Name="Price" Type="Decimal" />
<asp:Parameter Name="PlantID" Type="Int32" />
</UpdateParameters>
</asp:SqlDataSource>
下面是隱藏文件中的代碼：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.OleDb;
public partial class Staff : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
BindDataPlant();
}
}
private void BindDataPlant()
{
OleDbConnection Conn = new OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0; Data Source=" + Server.MapPath("~/App_Data/LincolnGardenCentre.accdb;"));
try
{
Conn.Open();
if (Conn.State.ToString() == "Open")
Page.Title = "Connection Successful";
else
Page.Title = "Connection Unsuccessful";
OleDbCommand Comm = new OleDbCommand();
Comm.Connection = Conn;
Comm.CommandText = "Select * FROM Plants;";
OleDbDataAdapter DA = new OleDbDataAdapter();
DA.SelectCommand = Comm;
DataSet DS = new DataSet();
OleDbCommandBuilder CB = new OleDbCommandBuilder(DA);
DA.Fill(DS, "PLANTS");
}
catch (Exception e)
{
Response.Redirect("Error.aspx");
}
finally
{
Conn.Close();
Conn.Dispose();
}
}
protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
{
GridView1.EditIndex = e.NewEditIndex;
BindDataPlant();
}
protected void GridView1_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
{
e.Cancel = true;
GridView1.EditIndex = -1;
BindDataPlant();
}
protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
GridViewRow row = (GridViewRow)GridView1.Rows[e.RowIndex];
int PlantID = Int32.Parse(GridView1.DataKeys[e.RowIndex].Value.ToString());
TextBox txtLatinName = (TextBox)row.FindControl("txtLatinName");
TextBox txtPopularName = (TextBox)row.FindControl("txtPopularName");
TextBox txtSeason = (TextBox)row.FindControl("txtSeason");
TextBox txtAftercare = (TextBox)row.FindControl("txtAftercare");
TextBox txtCategories = (TextBox)row.FindControl("txtCategories");
TextBox txtDescription = (TextBox)row.FindControl("txtDescription");
TextBox txtUses = (TextBox)row.FindControl("txtUses");
TextBox txtFoliageColour = (TextBox)row.FindControl("txtFoliageColour");
TextBox txtFlowerColour = (TextBox)row.FindControl("txtFlowerColour");
TextBox txtFloweringPeriod = (TextBox)row.FindControl("txtFloweringPeriod");
TextBox txtHeight = (TextBox)row.FindControl("txtHeight");
TextBox txtSpread = (TextBox)row.FindControl("txtSpread");
TextBox txtInstructions = (TextBox)row.FindControl("txtInstructions");
TextBox txtPrice = (TextBox)row.FindControl("txtPrice");
OleDbConnection Conn = new OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0; Data Source=" + Server.MapPath("~/App_Data/LincolnGardenCentre.accdb;"));
try
{
Conn.Open();
if (Conn.State.ToString() == "Open")
Page.Title = "Connection Successful";
else
Page.Title = "Connection Unsuccessful";
OleDbCommand Comm = new OleDbCommand();
Comm.Connection = Conn;
Comm.Parameters.Add("@PlantID", OleDbType.Integer).Value = PlantID.ToString();
Comm.Parameters.Add("@LatinName", OleDbType.VarChar).Value = txtLatinName.Text;
Comm.Parameters.Add("@PopularName", OleDbType.VarChar).Value = txtPopularName.Text;
Comm.Parameters.Add("@Season", OleDbType.VarChar).Value = txtSeason.Text;
Comm.Parameters.Add("@Aftercare", OleDbType.VarChar).Value = txtAftercare.Text;
Comm.Parameters.Add("@Categories", OleDbType.VarChar).Value = txtCategories.Text;
Comm.Parameters.Add("@Description", OleDbType.VarChar).Value = txtDescription.Text;
Comm.Parameters.Add("@Uses", OleDbType.VarChar).Value = txtUses.Text;
Comm.Parameters.Add("@FoliageColour", OleDbType.VarChar).Value = txtFoliageColour.Text;
Comm.Parameters.Add("@FlowerColour", OleDbType.VarChar).Value = txtFlowerColour.Text;
Comm.Parameters.Add("@FloweringPeriod", OleDbType.VarChar).Value = txtFloweringPeriod.Text;
Comm.Parameters.Add("@Height", OleDbType.VarChar).Value = txtHeight.Text;
Comm.Parameters.Add("@Spread", OleDbType.VarChar).Value = txtSpread.Text;
Comm.Parameters.Add("@Instructions", OleDbType.VarChar).Value = txtInstructions.Text;
Comm.Parameters.Add("@Price", OleDbType.Decimal).Value = txtPrice.Text;
Comm.CommandText = "UPDATE Plants SET LatinName = @LatinName, PopularName = @PopularName, Season = @Season, Aftercare = @Aftercare, Categories = @Categories, Description = @Description, Uses = @Uses, FoliageColour = @FoliageColour, FlowerColour = @FlowerColour, FloweringPeriod = @FloweringPeriod, Height = @Height, Spread = @Spread, Instructions = @Instructions, Price = @Price WHERE PlantID = @PlantID";
Comm.Connection = Conn;
Comm.ExecuteNonQuery();
GridView1.EditIndex = -1;
BindDataPlant();
}
catch (Exception ex)
{
Response.Redirect("Error.aspx");
}
finally
{
Conn.Close();
Conn.Dispose();
}
}
}
任何人都可以擺脫任何光線到這裏發生了什麼？
由於
把一個brakepoint內GridView1_RowUpdating，做文本框的值（txtLatinName.Text，txtPopularName.Text等）有值嗎？或者它只是空的字符串？ –
爲什麼在標記中使用SqlDataSource，然後在代碼中使用OleDbDataAdapter來完成所有這些工作？ – jadarnel27