在带有find控件属性的gridview asp.net中进行图像绑定 [英] Image Binding in gridview asp.net with find control property

问题描述

我试图从按钮点击事件中设置图片源URL，但给出错误EventArgs不包含定义的行图像gridview

Gridview代码：

p>

 < asp：GridView ID =GridView1runat =serverAutoGenerateColumns =FalseCellPadding =4ForeColor = ＃333333GridLines =NoneHeight =222pxWidth =859pxstyle =text-align：center;> 
< AlternatingRowStyle BackColor =WhiteForeColor =＃284775/> 
<列> 
< asp：BoundField HeaderText =ArtistDatafield =Artist/> 
< asp：BoundField HeaderText =AlbumDatafield =Album/> 
< asp：BoundField HeaderText =PlaycountDatafield =Playcount/> 
 
< asp：TemplateField HeaderText =专辑封面> 
< ItemTemplate> 
< asp：Image ID =Image1runat =serverwidth =174pxheight =174px/> 
< / ItemTemplate> 
< / asp：TemplateField> 
 
< /列> 
< EditRowStyle BackColor =＃999999/> 
< FooterStyle BackColor =＃5D7B9DFont-Bold =TrueForeColor =White/> 
< HeaderStyle BackColor =＃5D7B9DFont-Bold =TrueForeColor =White/> 
 < RowStyle BackColor =＃F7F6F3ForeColor =＃333333/> 
< SelectedRowStyle BackColor =＃E2DED6Font-Bold =TrueForeColor =＃333333/> 
< SortedAscendingCellStyle BackColor =＃E9E7E2/> 
< SortedAscendingHeaderStyle BackColor =＃506C8C/> 
< SortedDescendingCellStyle BackColor =＃FFFDF8/> 
< SortedDescendingHeaderStyle BackColor =＃6F8DAE/> 
< / asp：GridView> 
  

从json绑定：

  protected void btnMusic_Submit_Click（object sender，EventArgs e）
 {
 
 if（txtMusic.Text！= null&&txtMusic.Text！=） 
 {
 string artist = txtMusic.Text; 
 var requestUrl =http://ws.audioscrobbler.com/2.0/?method=artist.gettopalbums&artist=+ artist +& api_key = []& format = json; 
 var client = new WebClient（）; 
 client.Headers.Add（user-agent，Mozilla / 5.0（Windows NT 6.1; Win64; x64）AppleWebKit / 537.36（KHTML，如Gecko）Chrome / 58.0.3029.110 Safari / 537.36）; 
 var response = client.DownloadString（requestUrl）; 
 response = response.Replace（@＃text，text）; 
 dynamic stuff = JObject.Parse（response）; 
 DataTable dt = new DataTable（）; 
 dt.Columns.Add（Artist，typeof（string））; 
 dt.Columns.Add（Album，typeof（string））; 
 dt.Columns.Add（Playcount，typeof（string））; 
 dt.Columns.Add（AlbumArt，typeof（string））; 
 for（int i = 0; i <5; i ++）
 {
 lblInfo.InnerText = artist; 
 name =（stuff.topalbums.album [i] .name.ToString（））; 
 playcount = stuff.topalbums.album [i] .playcount.ToString（）; 
 image = stuff.topalbums.album [i] .image [2] .text.ToString（）; 
 System.Web.UI.WebControls.Image img =（System.Web.UI.WebControls.Image）e.Row.Cells [2] .FindControl（Image1）; 
 img.ImageUrl =图片; 
 
 dt.Rows.Add（artist，name，playcount，image）; 
} 
 GridView1.DataSource = dt; 
 GridView1.DataBind（）; 
} 
 else 
 lblInfo.InnerText =请输入艺术家姓名; 
} 
  

这里是代码抛出错误：

  System.Web.UI.WebControls.Image img =（System.Web.UI.WebControls.Image）e.Row.Cells [2] .FindControl（Image1 ）; 
 img.ImageUrl =图片; //这是错误来源
  

解决方案

问题不在于这一行

  img.ImageUrl = image; 
  

但前行

  System.Web.UI.WebControls.Image img =（System.Web.UI.WebControls.Image）e.Row.Cells [2] .FindControl（Image1）; 
  

您正在使用 e.Row.Cells ，但是您在Button Click中使用它，而不是RowDataBound事件，因此 e 没有 Row 属性。使用

  GridView1.Rows [i] .Cells [2] .FindControl（Image1）; 
  

I'm trying to set image source URL from button click event but gives error "EventArgs does not contain definition for row image gridview"

Gridview Code:

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" CellPadding="4" ForeColor="#333333" GridLines="None" Height="222px" Width="859px"  style="text-align:center;">
                        <AlternatingRowStyle BackColor="White" ForeColor="#284775" />
                        <Columns>
                            <asp:BoundField HeaderText="Artist" Datafield="Artist"/>
                            <asp:BoundField HeaderText="Album" Datafield="Album"/>
                            <asp:BoundField HeaderText="Playcount" Datafield="Playcount"/>

                            <asp:TemplateField HeaderText="Album Art">
                                <ItemTemplate>
                                    <asp:Image ID="Image1" runat="server" width="174px" height="174px"/>
                                </ItemTemplate>
                            </asp:TemplateField>

                        </Columns>
                        <EditRowStyle BackColor="#999999" />
                        <FooterStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
                        <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>

Binding from json:

protected void btnMusic_Submit_Click(object sender, EventArgs e)
    {

        if (txtMusic.Text != null && txtMusic.Text != "")
        {
            string artist = txtMusic.Text;
            var requestUrl = "http://ws.audioscrobbler.com/2.0/?method=artist.gettopalbums&artist=" + artist + "&api_key=[]&format=json";
            var client = new WebClient();
            client.Headers.Add("user-agent", "Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome / 58.0.3029.110 Safari / 537.36");
            var response = client.DownloadString(requestUrl);
            response = response.Replace(@"#text", "text");
            dynamic stuff = JObject.Parse(response);
            DataTable dt = new DataTable();
            dt.Columns.Add("Artist", typeof(string));
            dt.Columns.Add("Album", typeof(string));
            dt.Columns.Add("Playcount", typeof(string));
            dt.Columns.Add("AlbumArt", typeof(string));
            for (int i = 0; i < 5; i++)
            {
                lblInfo.InnerText = artist;
                name = (stuff.topalbums.album[i].name.ToString());
                playcount = stuff.topalbums.album[i].playcount.ToString();
                image = stuff.topalbums.album[i].image[2].text.ToString();
                System.Web.UI.WebControls.Image img = (System.Web.UI.WebControls.Image)e.Row.Cells[2].FindControl("Image1");
                img.ImageUrl = image;

                dt.Rows.Add(artist, name, playcount, image);
            }
            GridView1.DataSource = dt;
            GridView1.DataBind();
        }
        else
            lblInfo.InnerText = "Please Enter an Artist Name";
    }

Here is the code throwing error:

System.Web.UI.WebControls.Image img = (System.Web.UI.WebControls.Image)e.Row.Cells[2].FindControl("Image1");
img.ImageUrl = image; // This is where Error Comes

解决方案

The problem is not this line

img.ImageUrl = image;

But the line before

System.Web.UI.WebControls.Image img = (System.Web.UI.WebControls.Image)e.Row.Cells[2].FindControl("Image1");

You are using e.Row.Cells, but you are using this in a Button Click, not a RowDataBound event so e does not have a Row property. Use

GridView1.Rows[i].Cells[2].FindControl("Image1");

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