Question

我在aspx上创建了一个图像控件，代码如下

<div>
    <div class="ajaxdata">
        <asp:Image ID="image2" runat="server"></asp:Image>
    </div>
    <a class="ajaxcall">click to see image </a>
</div>

然后，对于正常按钮单击，我将使用处理程序

动态获取图像

public void ProcessRequest(HttpContext context)
    {
        context.Response.Clear();

        if (!String.IsNullOrEmpty(context.Request.QueryString["id"]))
        {
            int id = Int32.Parse(context.Request.QueryString["id"]);

            // Now you have the id, do what you want with it, to get the right image
            // More than likely, just pass it to the method, that builds the image
            Image image = GetImage(id);

            // Of course set this to whatever your format is of the image
            context.Response.ContentType = "image/jpeg";
            // Save the image to the OutputStream
            image.Save(context.Response.OutputStream, ImageFormat.Jpeg);
        }
        else
        {
            context.Response.ContentType = "text/html";
            context.Response.Write("<p>Need a valid id</p>");
        }
    }

    public bool IsReusable
    {
        get
        {
            return false;
        }
    }
    private Image GetImage(int id)
    {
        string path = string.Empty;
        SqlConnection con = new System.Data.SqlClient.SqlConnection();
        con.ConnectionString = @"Data Source=.\SQLEXPRESS;AttachDbFilename='C:\Users\1483\Documents\Visual Studio 2010\Projects\WebApplication2\WebApplication2\App_Data\Database1.mdf';Integrated Security=True;Connect Timeout=30;User Instance=True";
        con.Open();
        SqlCommand cmd = new SqlCommand(@"SELECT Path FROM Temp WHERE Id=@idparam", con);
        SqlParameter idparam = cmd.Parameters.Add("@idparam", SqlDbType.NVarChar,10);
        idparam.Value = id.ToString();
        SqlDataReader rd = cmd.ExecuteReader();
        if (rd.Read())
        {
             path = rd.GetString(0);
        }
        byte[] data= File.ReadAllBytes(path);
        MemoryStream stream = new MemoryStream(data);
        return Image.FromStream(stream);
    }

按钮点击c＃代码

image2.ImageUrl = "Handler1.ashx?id=" + txtid.Text;

现在这完全正常工作我想通过ajax调用获取图像并使用相同的处理程序将其分配给图像控件，所以我写了一个ajax调用，如下所示

$('.ajaxcall').click(function () {
            var id = $('#txtid').val();
            var data = 'id=' + id;
            $.ajax({
                type: "GET",
                cache: false,
                url: "Handler1.ashx",
                data: data,    // multiple data sent using ajax
                success: function (html) {
                    $('#image2').val(html);  
                    //This where i need to assign the image stream to the image control i don't know how to do it.                     
                }
            });
            return false;
        });

它正在发送所需的数据并从数据库中取出图像并发送回来，但我无法将其分配给图像控件。我如上所述分配它，它显示所有符号，我猜这是数据，但如何表示它图像格式任何帮助或解决方法都很棒

先谢谢。

Answer 1

我知道一个解决方案可以为你工作，你不必使用ajax调用就可以了，只需这样做，

 $('.ajaxcall').click(function () {
 var id = $('#txtid').val();
 var data = 'id=' + id;
 var imageurl = 'Handler1.ashx?' + data;
 $('#image2').attr('src', imageurl);
 });

这将为您提供图像

如何将ajax响应图像流分配给图像控件？

1 个答案: