teechar控件在ASP.NET中的为什么显示红叉(图片不显)

Question

具体代码如下: 
teecher 输出图片流并保存到 session("ch1")里
Me.WebChart1.Chart.Export.Template.Save(tmpchart)
                Session.Add("ch1", tmpchart)
  另一个图片显示也免得代码             
If Me.Session("ch1") IsNot Nothing Then
            Dim chartStream As New IO.MemoryStream            chartStream = CType(Session("ch1"), IO.MemoryStream)
            Response.OutputStream.Write(chartStream.ToArray(), 0, CInt(chartStream.Length))
            chartStream.Close()
            'Session.Remove(chartName)        End If

Answer 1

Me.WebChart1.Chart.Export.Template.Save(tmpchart)
                Session.Add("ch1", tmpchart) tmpchart 都改为 Server.MapPath(tmpchart)

Answer 2

在一个Me.WebChart1.Chart.Export.Template.Save(tmpchart) 他存的是个内存流 不是文件啊