asp.net - #评估图像数据

Question

如何使用 Eval 将 sql varbinary 数据（图像）绑定到图像？像这样的东西：

   <image src = <%# Eval("imageBinaryData") %> />

Answer 1

您需要使用 HttpHandler 来获取数据并将其流回。然后，您将从 ASPX 页面链接到处理程序。

<img class="mainEventsImage" 
    src='<%# Eval("MainImagePath").ToString().Replace("\\", "/") %>' 
        alt='<%# Eval("Title") %>' runat="server" />

if (reader.Read())
{
    int bufferSize = 100;
    byte[] bytes = new byte[bufferSize];
    long bytesRead;
    long readFrom = 0;

    do
    {
        bytesRead = reader.GetBytes(0, readFrom, bytes, 0, bufferSize);
        context.Response.ContentType = "image/jpeg";
        context.Response.BinaryWrite(bytes);
        readFrom += bufferSize;
    }
    while (bytesRead == bufferSize);
}
reader.Close();