图片绑定问题

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<?xml version="1.0" encoding="UTF-8"?>
<ActiveReportsLayout Version="3.1" PrintWidth="11906" DocumentName="ARNet Document" ScriptLang="C#" MasterReport="0">
<Sections>
      <Section Type="ReportHeader" Name="ReportHeader1" Height="0" BackColor="16777215" />
      <Section Type="PageHeader" Name="PageHeader1" Height="469.7938" BackColor="16777215">
         <Control Type="AR.Line" Name="horizontalLine1" X1="14.8481" Y1="164.8294" X2="11863.5164" Y2="164.8294" />
         <Control Type="AR.Line" Name="horizontalLine2" X1="14.8481" Y1="479.7938" X2="11863.5164" Y2="479.7938" />
         <Control Type="AR.Line" Name="PageHeaderVerticalBar0" X1="14.8481" Y1="164.8294" X2="14.8481" Y2="509.7938" />
         <Control Type="AR.Line" Name="PageHeaderVerticalBar1" X1="3974.3530" Y1="164.8294" X2="3974.3530" Y2="509.7938" />
         <Control Type="AR.Line" Name="PageHeaderVerticalBar2" X1="7933.8578" Y1="164.8294" X2="7933.8578" Y2="509.7938" />
         <Control Type="AR.Line" Name="PageHeaderVerticalBar3" X1="11863.5164" Y1="164.8294" X2="11863.5164" Y2="509.7938" />
      </Section>
      <Section Type="Detail" Name="Detail1" Height="324.9606" BackColor="16777215">
         <Control Type="AR.Line" Name="horizontalLine3" X1="14.8481" Y1="319.9606" X2="11863.5164" Y2="319.9606" />
         <Control Type="AR.Line" Name="DetailVerticalBar0" X1="14.8481" Y1="0" X2="14.8481" Y2="314.9606" />
         <Control Type="AR.Line" Name="DetailVerticalBar1" X1="3974.3530" Y1="0" X2="3974.3530" Y2="314.9606" />
         <Control Type="AR.Line" Name="DetailVerticalBar2" X1="7933.8578" Y1="0" X2="7933.8578" Y2="314.9606" />
         <Control Type="AR.Line" Name="DetailVerticalBar3" X1="11863.5164" Y1="0" X2="11863.5164" Y2="304.9606" />
         <Control Type="AR.Image" Name="Picture40" DataField="MdPicUrl" Left="3989.3511" Top="94.9981" Width="3824.5217" Height="284.9644"/>
         <Control Type="AR.Field" Name="Textbox2" DataField="MdCode" Left="29.8463" Top="94.9981" Width="3824.5217" Height="284.9644" Text="商品编码" Style="font-family:宋体; font-size:10.5pt; vertical-align:top; text-align:left;vertical-align: middle; ddo-char-set: 0;" />
      </Section>
      <Section Type="PageFooter" Name="PageFooter1" Height="0" BackColor="16777215" />
      <Section Type="ReportFooter" Name="ReportFooter1" Height="885.0019" BackColor="16777215">
         <Control Type="AR.Line" Name="horizontalLine4" X1="14.8481" Y1="399.9587" X2="11863.5164" Y2="399.9587" />
         <Control Type="AR.Line" Name="PageFooterVerticalBar0" X1="14.8481" Y1="-40" X2="14.8481" Y2="404.9587" />
         <Control Type="AR.Line" Name="PageFooterVerticalBar1" X1="3974.3530" Y1="-40" X2="3974.3530" Y2="404.9587" />
         <Control Type="AR.Line" Name="PageFooterVerticalBar2" X1="7933.8578" Y1="-40" X2="7933.8578" Y2="404.9587" />
         <Control Type="AR.Line" Name="PageFooterVerticalBar3" X1="11863.5164" Y1="-40" X2="11863.5164" Y2="399.9587" />
      </Section>
</Sections>
<ReportComponentTray />
<Script>
      <![CDATA[public void Detail1_BeforePrint(){ControlCollection ctl = rpt.Sections["Detail1"].Controls;float y = 0;foreach(object obj in ctl){if (obj is Line){Line l = (Line)obj;if (l.Y1 == l.Y2)y = l.Y1;}}foreach(object obj in ctl){if(obj is Line){Line l = (Line)obj;if (l.X1 == l.X2)l.Y2 = y;}}}]]>
</Script>
<PageSettings LeftMargin="567" RightMargin="567" TopMargin="567" BottomMargin="567" PaperWidth="13040" PaperHeight="11169" PaperSize="0" PaperName="Custom paper" />
<Parameters />
</ActiveReportsLayout>

数据源绑定：

foreach (DataRow row in table.Rows)
            {
                  //var buff = Convert.FromBase64String(row["Img"].ToString());
                  row["MdPicUrl"] = "http://img10.360buyimg.com/n0/jfs/t19669/78/1470434306/357290/f5ff6839/5acc84faN1c77a4a5.jpg";
            }
            //dv = table.DefaultView;

            report.DataSource = dv;
            report.Document.Printer.PrinterName = "";
            report.Run(true);

这样图片无法显示