图像未显示在asp.net gridview中 [英] Image not displaying in asp.net gridview
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问题描述
你好
在asp.net的网格视图中单击更新"按钮后，图像不显示.
它显示了十字架.
我的aspx代码如下:
Hello
Image not displaying after i click update button in grid view in asp.net.
It disply''s cross.
My code for aspx is as follows:
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="MainTable.aspx.cs" Inherits="commonlogin.MainTable" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>GridView</title>
<link href="Content/StyleSheet1.css" rel="stylesheet" type="text/css" />
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns ="False"
AutoGenerateDeleteButton="True" onrowdeleted="GridView1_RowDeleted" AutoGenerateEditButton ="True"
onrowdeleting="GridView1_RowDeleting" onrowediting="GridView1_RowEditing"
onrowupdating="GridView1_RowUpdating"
onpageindexchanging="GridView1_PageIndexChanging"
onrowcancelingedit="GridView1_RowCancelingEdit" AllowPaging="True" CssClass ="bodytext"
AllowSorting="True" CellPadding="4"
GridLines="None" onselectedindexchanged="GridView1_SelectedIndexChanged"
ForeColor="#333333" >
<AlternatingRowStyle BackColor="White" ForeColor="#284775" />
<Columns>
<asp:TemplateField HeaderText="ID" >
<%--<EditItemTemplate>
<asp:TextBox ID="txtID" runat="server" Text='<%# Bind("ID") %>'></asp:TextBox>
</EditItemTemplate>--%>
<ItemTemplate>
<%--<asp:Label ID="Label1" runat="server" ImageUrl='<%# "Handler1.ashx?ID=" + Eval("ID")%>' Text='<%# Bind("ID") %>'></asp:Label>--%>
<asp:Label ID="lblID" runat="server" CssClass="bodytext" Text='<%# Bind("ID") %>'></asp:Label>
</ItemTemplate>
<ItemStyle HorizontalAlign="Left" />
</asp:TemplateField>
<asp:TemplateField HeaderText="Name">
<EditItemTemplate>
<asp:TextBox ID="txtName" runat="server" CssClass ="TextBox" Text='<%# Bind("Name") %>'></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="lblName" runat="server" CssClass="bodytext" Text='<%# Bind("Name") %>'></asp:Label>
</ItemTemplate>
<ItemStyle HorizontalAlign="Left" />
</asp:TemplateField>
<asp:TemplateField HeaderText="Description">
<EditItemTemplate>
<asp:TextBox ID="txtDesc" runat="server" CssClass ="TextBox" Text='<%# Bind("Description") %>'></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="lblDesc" runat="server" CssClass="bodytext" Text='<%# Bind("Description") %>'></asp:Label>
</ItemTemplate>
<ItemStyle HorizontalAlign="Left" />
</asp:TemplateField>
<asp:TemplateField HeaderText="Image">
<EditItemTemplate>
<%--<asp:TextBox ID="txtImage" runat="server" CssClass ="TextBox" EnableViewState="true" Text='<%# Bind("Image") %>' ></asp:TextBox>--%>
<asp:Image ID="Image1" runat="server" EnableViewState="true" ImageUrl='<%# "Handler1.ashx?ID=" + Eval("ID")%>'/>
<asp:FileUpload ID="FileUpload2" runat="server" />
<asp:Button ID="btnUpdate" runat="server" OnClick="btnUpdate_Click" Text="Update Image" />
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
<%--<asp:TextBox ID="txtImage" runat="server" CssClass ="TextBox"></asp:TextBox>--%>
</EditItemTemplate>
<ItemTemplate>
<asp:Image ID="Image1" runat="server" EnableViewState="true" ImageUrl='<%# "Handler1.ashx?ID=" + Eval("ID")%>'/>
<%-- <asp:FileUpload ID="FileUpload2" runat="server" />
<asp:Button ID="btnUpdate" runat="server" OnClick="btnUpdate_Click" Text="Update Image" />
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
--%>
<%--<asp:Image ID="Image2" runat="server" ImageUrl='<%# "Handler1.ashx?ID=" + Bind("ID")%>'/>--%>
<%--<asp:Label ID="lblImage" runat="server" Text='<%# Bind("Image") %>'></asp:Label>--%>
<%--<asp:Label ID="lblImage" runat="server" ImageUrl='<%# "Handler1.ashx?ID=" + Eval("ID") %>'></asp:Label>--%>
<%--<asp:Label ID="Label1" runat="server" ImageUrl='<%# "Handler1.ashx?ID=" + Eval("ID")%>' Text='<%# Bind("Image") %>'></asp:Label>--%>
</ItemTemplate>
<ItemStyle HorizontalAlign="Left" BackColor ="AliceBlue" />
<%--<asp:FileUpload ID="FileUpload2" runat="server" />
<asp:Button ID="btnUpdate" runat="server" OnClick="btnUpdate_Click" Text="Update Image" />--%>
</asp:TemplateField>
<asp:TemplateField HeaderText="Active">
<EditItemTemplate>
<asp:TextBox ID="txtActive" runat="server" CssClass ="TextBox" Text='<%# Bind("Active") %>'></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="lblActive" runat="server" CssClass="bodytext" Text='<%# Bind("Active") %>'></asp:Label>
</ItemTemplate>
<ItemStyle HorizontalAlign="Left" />
</asp:TemplateField>
<asp:TemplateField HeaderText="CreatedBy">
<EditItemTemplate>
<asp:TextBox ID="txtCreatedBy" runat="server" CssClass ="TextBox" Text='<%# Bind("CreatedBy") %>'></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="lblCreatedBy" runat="server" CssClass="bodytext" Text='<%# Bind("CreatedBy") %>'></asp:Label>
</ItemTemplate>
<ItemStyle HorizontalAlign="Left" />
</asp:TemplateField>
<asp:TemplateField HeaderText="CreatedDate">
<EditItemTemplate>
<asp:TextBox ID="txtCreatedDate" runat="server" CssClass ="TextBox" Text='<%# Bind("CreatedDate") %>'></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="lblCreatedDate" runat="server" CssClass="bodytext" Text='<%# Bind("CreatedDate") %>'></asp:Label>
</ItemTemplate>
<ItemStyle HorizontalAlign="Left" />
</asp:TemplateField>
</Columns>
<EditRowStyle BackColor="#999999" />
<FooterStyle BackColor="#5D7B9D" ForeColor="White" Font-Bold="True" />
<HeaderStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
<PagerStyle BackColor="#284775" ForeColor="White" HorizontalAlign="Center" />
<RowStyle BackColor="#F7F6F3" ForeColor="#333333" />
<SelectedRowStyle BackColor="#E2DED6" Font-Bold="True" ForeColor="#333333" />
<SortedAscendingCellStyle BackColor="#E9E7E2" />
<SortedAscendingHeaderStyle BackColor="#506C8C" />
<SortedDescendingCellStyle BackColor="#FFFDF8" />
<SortedDescendingHeaderStyle BackColor="#6F8DAE" />
</asp:GridView><br />
<%--<asp:FileUpload ID="FileUpload2" runat="server" />--%>
<%--<asp:Button ID="btnUpdate" runat="server" OnClick="btnUpdate_Click" Text="Update Image" />
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>--%>
<tr>
<td>
</div>
<asp:HyperLink ID="HyperLink1" CssClass ="wishlist " NavigateUrl ="~/TableAdd.aspx" runat="server">AddNew</asp:HyperLink><br /><br />
</td>
</tr>
<asp:label id="Messagelbl" forecolor="Red" CssClass="wishlist" runat="server"/>
</form>
</body>
</html>
我的aspx.cs代码是:
And my aspx.cs code is:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
using System.Data.SqlTypes;
using System.Data;
using System.Configuration;
using System.IO;
namespace commonlogin
{
public partial class MainTable : System.Web.UI.Page
{
SqlConnection conn = new SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings["DefaultConnection"].ConnectionString);
SqlCommand cmd = new SqlCommand();
byte[] filebyte = null;
string guery;
protected void Page_Load(object sender, EventArgs e)
{
//SqlConnection conn = new SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings["DefaultConnection"].ConnectionString);
if (!IsPostBack)
{
bind();
}
}
protected void GridView1_RowDeleted(object sender, GridViewDeletedEventArgs e)
{
}
protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
GridViewRow row = (GridViewRow)GridView1.Rows[e.RowIndex];
Label lbldeleteid = (Label)row.FindControl("lblID");
conn.Open();
//SqlCommand cmd = new SqlCommand("SELECT * FROM tbl_SqlImage", conn);
SqlCommand cmd = new SqlCommand("Delete tbl_SqlImage where ID=" + lbldeleteid.Text + "", conn);
cmd.ExecuteNonQuery();
conn.Close();
bind();
}
public void bind()
{
conn.Open();
SqlDataAdapter da = new SqlDataAdapter("SELECT * FROM tbl_SqlImage", conn);
DataSet ds = new DataSet();
da.Fill(ds);
if (ds.Tables[0].Rows.Count != 0)
{
GridView1.DataSource = ds;
GridView1.DataBind();
}
conn.Close();
}
protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
{
GridView1.EditIndex = e.NewEditIndex;
bind();
//GridView1.DataBind();
}
//june 25
public byte[] convertByte(FileUpload FileControl)
{
Stream fs = default(Stream);
byte[] bytes1 = null;
byte[] postfile = null;
fs = FileControl.PostedFile.InputStream;
BinaryReader br1 = new BinaryReader(fs);
bytes1 = br1.ReadBytes(FileControl.PostedFile.ContentLength);
postfile = bytes1;
return postfile;
}
//june25
protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
//june25
GridViewRow row = (GridViewRow)GridView1.Rows[e.RowIndex];
Label lblID = (Label)row.FindControl("lblID");
//Image Image = (Image)row.FindControl("Image1");
TextBox textName = (TextBox)row.FindControl("txtName");
TextBox textDesc = (TextBox)row.FindControl("txtDesc");
//TextBox textImage = (TextBox)row.FindControl("txtImage");
TextBox textActive = (TextBox)row.FindControl("txtActive");
TextBox textCreatedBy = (TextBox)row.FindControl("txtCreatedBy");
TextBox textCreatedDate = (TextBox)row.FindControl("txtCreatedDate");
//FileUpload FileUpload2 = (FileUpload)row.FindControl("FileUpload2");
FileUpload Image = (FileUpload)row.FindControl("FileUpload2");
//FileUpload FileUpload2 = (FileUpload)GridView1.Rows[e.RowIndex].FindControl("FileUpload2");
GridView1.EditIndex = -1;
conn.Open();
SqlCommand cmd = new SqlCommand("UPDATE tbl_SqlImage set Name='" + textName.Text + "' , Description='" + textDesc.Text + "' , Image='" + convertByte(Image) + "' , Active='" + textActive.Text + "' , CreatedBy='" + textCreatedBy.Text + "' , CreatedDate='" + textCreatedDate.Text + "' where ID='" + lblID.Text.Trim() + "' ", conn);
//SqlCommand cmd = new SqlCommand("UPDATE tbl_SqlImage set Name='" + textName.Text + "' , Description='" + textDesc.Text + "' , Image='" + textImage.Text + "' , Active='" + textActive.Text + "' , CreatedBy='" + textCreatedBy.Text + "' , CreatedDate='" + textCreatedDate.Text + "' where ID='" + lblID.Text.Trim() + "' ", conn);
cmd.ExecuteNonQuery();
conn.Close();
bind();
////GridView1.DataBind();
//june25
}
//june25 testing
//june25 testing
protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e)
{
GridView1.PageIndex = e.NewPageIndex;
bind();
}
protected void GridView1_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
{
GridView1.EditIndex = -1;
bind();
}
protected void GridView1_SelectedIndexChanged(object sender, EventArgs e)
{
}
protected void btnUpdate_Click(object sender, EventArgs e)
{
//int sizelimit = 5242880;
//if (FileUpload2.HasFile)
//{
// if (FileUpload2.PostedFile.ContentLength <= sizelimit)
// {
// string path = "D:\\uploads\\" + FileUpload2.FileName;
// FileUpload2.SaveAs(path);
// GridView1.DataBind();
// //Label1.Text = "File upload to" + path;
// }
// else
// {
// //Label1.Text = "File exceeds size limit";
// }
//}
}
}
}请帮助我.
推荐答案
更改
ImageUrl=''<%# "Handler1.ashx?ID=" + Eval("ID")%>''
到
ImageUrl=''<%# string.Format("Handler1.ashx?ID={0}",Eval("ID"))%>''
change
ImageUrl=''<%# "Handler1.ashx?ID=" + Eval("ID")%>''
to
ImageUrl=''<%# string.Format("Handler1.ashx?ID={0}",Eval("ID"))%>''
尝试这样的行数据绑定事件，然后从页面源中删除ImageUrl属性.
Hi,
Try in row databound event like this, and remove ImageUrl attribute from page source.
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
if(e.Row.RowType==DataControlRowType.DatRow)
{
string id = ((Label)e.Row.FindControl("lblID")).Text;
((Image)e.Row.FindControl("Image1")).ImageUrl="Handler1.ashx?ID=" + id +";
}
}
希望它能起作用.
hope it works.
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