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我正在使用 AsyncFileUpload (ajaxToolkit) 控件从注册页面上传图像文件。上传的文件内容存储到数据库中。所以我需要在 httphander 的 asp:image 控件中显示我上传的文件，比如<asp:image id="imgLogo" runat="server" ImageUrl="Images.aspx/id=12" />. 那么如何做到这一点。

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3 回答 3

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我已经查看了很多网站，我得到了这个问题的答案.. http://www.mikeborozdin.com/post/AJAX-File-Upload-in-ASPNET-with-the-AsyncFileUpload-Control.aspx

<ajaxToolkit:AsyncFileUpload ID="afuCompanyLogo" runat="server" 
            OnClientUploadError="uploadError" OnClientUploadComplete="uploadComplete"
            UploaderStyle="Modern" UploadingBackColor="#CCFFFF" 
            ThrobberID="myThrobber" 
        onuploadedcomplete="afuCompanyLogo_UploadedComplete" />
        <asp:Image ID="imgCompanylogo" CssClass="imgCompanylogo" runat="server" Height="80px" Width="80px" AlternateText="" />

protected void afuCompanyLogo_UploadedComplete(object sender, AjaxControlToolkit.AsyncFileUploadEventArgs e)
        {
            if(afuCompanyLogo.HasFile)
            {
                FileManagementEntity fileManagementEntity = new FileManagementEntity();
                FileManagement fileManagement = fileManagementEntity.Create();

                fileManagement.FileContentType = afuCompanyLogo.ContentType;
                fileManagement.FileContent = afuCompanyLogo.FileBytes;
                fileManagement.Size = afuCompanyLogo.FileBytes.Count();
                fileManagement.OriginalName = afuCompanyLogo.FileName;
                fileManagementEntity.Save(fileManagement);

                ViewState["logoID"] = fileManagement.FileManagementID;
                imgCompanylogo.ImageUrl = "Image.aspx?id=" + fileManagement.FileManagementID.ToString();
                ScriptManager.RegisterClientScriptBlock(afuCompanyLogo, afuCompanyLogo.GetType(), "img", "top.document.getElementById('" + imgCompanylogo.ClientID + "').src='Image.aspx?id=" + fileManagement.FileManagementID + "';", true);
            }
        }
于 2012-12-14T09:40:50.857 回答
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假设您将图像作为 byte[] 存储在 DB 中；

var data = new byte[1]; //Replace this with your values from DB
var mimeType = "application\pdf"; //Replace this with your values from DB
response.ContentType = mimeType ;
response.BinaryWrite(data);

在您从数据库中检索到值后，此代码应放置在 images.aspx 中的 page_load 中。

于 2012-12-14T09:03:53.720 回答
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您的图像页面处理程序 page_load 方法将是

图片.aspx

protected void Page_Load(sender s, eventagrs e){

var imagecontent= new byte[XXXX]; // Read DB content as bytes for the passed Id

response.ContentType = 'jpeg/gif/anything' ; 
//this should be a valid MIME type saved in database
response.BinaryWrite(imagecontent);

}

编辑：

From your comments you are trying to update the image tag src value 
from codebehind using Asp.Net Ajax. 

If you want to do this, first make sure your page has access to view state 
information  about those image tags. This is not a big deal, you simply 
wrap the image tags container panel/div with update panel. 

So your ajax request will send the information about those viewstate and 
push the partial update for those image container panel also.
于 2012-12-14T09:11:07.450 回答