Asp.net GridView OnRowUpdating

Question

我在gridview中使用OnRowUpdating 。 這很簡單，但是由於某種原因它沒有更新。 好像沒有找到EditTemplate控件。 它的設置有點不同，因為所有控件都在同一列中（可能會引起問題嗎？），並且以“博客”格式設置。 我沒有收到任何運行時錯誤，因此必須是邏輯上的。 這是asp。

ASP

<asp:GridView ID="gvPosts" runat="server" AutoGenerateColumns="False" DataKeyNames="MessageID" GridLines="Vertical" BackColor="White" BorderColor="#999999" BorderStyle="Solid" BorderWidth="1px" CellPadding="3" ForeColor="Black" Width="693px"
             OnPageIndexChanging="gvPosts_PageIndexChanging" OnRowEditing="gvPosts_RowEditing"
             OnRowCancelingEdit="gvPosts_RowCancelingEdit" OnRowUpdating="gvPosts_RowUpdating" AllowPaging="True">
            <AlternatingRowStyle BackColor="#CCCCCC" />
            <Columns>
                <asp:TemplateField HeaderText="Posts" HeaderStyle-Font-Size="Larger">
                    <EditItemTemplate>
                        <asp:Textbox ID="tbGridTitle" runat="server" Text='<%# Bind("Title") %>' Font-Bold="true" Font-Size="Large" ForeColor="#cc0000"></asp:Textbox>
                        <div style="margin-left: 20px">
                            <p>
                                <asp:Textbox ID="tbGridAuthor" runat="server" Text='<%# Bind("Author") %>' Font-Bold="true" Font-Size="Small" Width="150px"></asp:Textbox>                             
                                <asp:label ID="lblDate" runat="server" Text='<%# Bind("Date","{0:MM/dd/yyyy}") %>' Font-Bold="true" Font-Size="Small" Width="100px"></asp:label>
                                <asp:label ID="lblIPAddress" runat="server" Text='<%# Bind("IPAddress") %>' Font-Bold="true" Font-Size="Small" Width="100px" Visible="false"></asp:label>
                                <%--<asp:Label ID="lblMID" runat="server" Text='<%# "ImageHandler.ashx?mid="+ Eval("MessageID") %>'></asp:Label>--%>
                            </p>
                        </div>
                        <div style="margin-left: 40px">
                            <asp:TextBox ID="tbGridMessage" runat="server" Text='<%# Bind("Message") %>' TextMode="MultiLine" Width="450px"></asp:TextBox>
                            <div>
                                <asp:Image ID="postImage" runat="server" ImageUrl='<%# "ImageHandler.ashx?mid="+ Eval("MessageID") %>' Width="400px" AlternateText="No Image" ImageAlign="Middle" />
                            </div>
                        </div>
                    </EditItemTemplate>
                    <ItemTemplate>
                        <asp:Label ID="Label4" runat="server" Text='<%# Bind("Title") %>' Font-Bold="true" Font-Size="Large" ForeColor="#cc0000"></asp:Label>
                        <div style="margin-left: 20px">
                            <p>
                                <asp:Label ID="Label1" runat="server" Text='<%# Bind("Author") %>' Font-Bold="true" Font-Size="Small" Width="150px"></asp:Label>                             
                                <asp:Label ID="Label2" runat="server" Text='<%# Bind("Date","{0:MM/dd/yyyy}") %>' Font-Bold="true" Font-Size="Small" Width="100px"></asp:Label>
                                <asp:Label ID="lblIPAddress" runat="server" Text='<%# Bind("IPAddress") %>' Font-Bold="true" Font-Size="Small" Width="100px" Visible="false"></asp:Label>
                                <%--<asp:Label ID="lblMID" runat="server" Text='<%# "ImageHandler.ashx?mid="+ Eval("MessageID") %>'></asp:Label>--%>
                            </p>
                        </div>
                        <div style="margin-left: 40px">
                            <asp:Label ID="Label3" runat="server" Text='<%# Bind("Message") %>'></asp:Label>
                            <div>
                                <asp:Image ID="postImage" runat="server" ImageUrl='<%# "ImageHandler.ashx?mid="+ Eval("MessageID") %>' Width="400px" AlternateText="No Image" ImageAlign="Middle" Visible="false" />
                            </div>
                        </div>
                    </ItemTemplate>
                    <HeaderStyle Font-Size="Large" />
                </asp:TemplateField>
                <asp:TemplateField>
                    <ItemTemplate>
                        <asp:LinkButton runat="server" Text="View Comments" OnClick="lbViewComments_Click"></asp:LinkButton>
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:TemplateField HeaderText="MessageID" SortExpression="MessageID" Visible="true">
                    <ItemTemplate>
                        <asp:Label ID="lblMessageID" runat="server" Text='<%# Bind("MessageID") %>'></asp:Label>
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:TemplateField ShowHeader="False">
                    <EditItemTemplate>
                        <asp:LinkButton ID="lbUpdate" runat="server" CausesValidation="True" CommandName="Update" Text="Update"></asp:LinkButton>
                        &nbsp;<asp:LinkButton ID="LinkButton2" runat="server" CausesValidation="False" CommandName="Cancel" Text="Cancel"></asp:LinkButton>
                    </EditItemTemplate>
                    <ItemTemplate>
                        <asp:LinkButton ID="LinkButton1" runat="server" CausesValidation="False" CommandName="Edit" Text="Edit"></asp:LinkButton>
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:TemplateField ShowHeader="False" Visible="False">
                    <ItemTemplate>
                        <asp:LinkButton ID="lbDelete" runat="server" CausesValidation="False" CommandName="Delete" Text="Delete" OnClick="lbDelete_Click"></asp:LinkButton>
                    </ItemTemplate>
                </asp:TemplateField>
            </Columns>
        </asp:GridView>

這是我的RowUpdating代碼。

C＃

    protected void gvPosts_RowUpdating(object sender, GridViewUpdateEventArgs e)
    {
        GridViewRow gvr = (GridViewRow)gvPosts.Rows[e.RowIndex];

        int MessageID = Convert.ToInt32(gvPosts.DataKeys[e.RowIndex].Value.ToString());
        TextBox Title = (TextBox)gvr.FindControl("tbGridTitle");
        TextBox Message = (TextBox)gvr.FindControl("tbGridMessage");
        TextBox Author = (TextBox)gvr.FindControl("tbGridAuthor");

        try
        {
            conn.Open();
            SqlCommand cmdUpdate = new SqlCommand("UPDATE BlogMessages SET Title = @Title, Message = @Message, Author = @Author WHERE MessageID = @MessageID", conn);
            cmdUpdate.Parameters.AddWithValue("@MessageID", MessageID);
            cmdUpdate.Parameters.AddWithValue("@Title", Title.Text);
            cmdUpdate.Parameters.AddWithValue("@Message", Message.Text);
            cmdUpdate.Parameters.AddWithValue("@Author", Author.Text);
            cmdUpdate.ExecuteNonQuery();
            conn.Close();

            gvPosts.EditIndex = -1;

            DataBound();
            GridControls();
        }
        catch (Exception ex)
        {
            lblMessage.Text = "Couldn't update! " + ex.ToString();
        }
    }

其他所有內容都類似於RowEditing和RowEditCanceling但是由於某些原因，我無法更新。 我認為一些新鮮的眼睛也許能夠捕捉到我所缺少的東西。

我也嘗試過這種方法來找到控件，但是沒有運氣。

TextBox Title = (TextBox)gvPosts.Rows[e.RowIndex].FindControl("tbGridTitle");

我已經嘗試了多種方法，但我不記得全部。 提前致謝！

Answer 1

觸發事件的順序可能是問題。請確保您具有與以下事件相同的設置，並對其進行修改以適合您的需求。 我創建了一個Post類

 public class Post 
{
    public String Author { get; set; }
    public String Title { get; set; }
    public DateTime Date { get; set; }
    public String IPAddress { get; set; }
    public String Message {get;set;}
    public String MessageID { get; set; }

}

然后使用此代碼對其進行測試

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

    public void BindData()
    {
        ArrayList myList = new ArrayList();

        myList.Add(new Post() { Author = "Abide", Title = "The Post", Date = DateTime.Now, IPAddress = "192.168.0.9", Message = "It works", MessageID = "5" });

        gvPosts.DataSource = myList;
        gvPosts.DataBind();
    }
    protected void gvPosts_RowUpdating(object sender, GridViewUpdateEventArgs e)
    {
        GridViewRow gvr = (GridViewRow)gvPosts.Rows[e.RowIndex];

        int MessageID = Convert.ToInt32(gvPosts.DataKeys[e.RowIndex].Value.ToString());
        TextBox Title = (TextBox)gvr.FindControl("tbGridTitle");
        TextBox Message = (TextBox)gvr.FindControl("tbGridMessage");
        TextBox Author = (TextBox)gvr.FindControl("tbGridAuthor");

     // do your stuff here

    }

    protected void gvPosts_RowEditing(object sender, GridViewEditEventArgs e)
    {
        gvPosts.EditIndex = e.NewEditIndex;
        BindData();

    }

    protected void gvPosts_RowCommand(object sender, GridViewCommandEventArgs e)
    {

    }

    protected void gvPosts_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
    {
        gvPosts.EditIndex = -1;
        BindData();

    }


}

Answer 2

原來我忽略了我的Page_Load。 我有..

if(Page.IsPostBack)
{
    //code here
}

代替..

if(!Page.IsPostBack)
{
    //code here
}

新的一天，新鮮的眼睛，終於抓住了我的錯誤。 希望這可以節省將來的時間。