在vs2005中用gridview显示表中的image字段

目标:用gridview显示northwind中employee表的photo字段

步骤一:用SqlDataSource连接到northwind并获取employee表,我这里选取了:EmployeeID, LastName, FirstName, Country, Photo这几个字段。完成后如果:




步骤二:从“GridView Tasks”上选择"Edit Columns", 弹出Fields对话框。在“Availabe fields”里选ImageField之后,点击“Add”按钮,在ImageField Properties中的HeadText填入"Picture", 然后点击“Convert this field into a TemplateField”链接,最后点击 OK 按钮。



步骤三:新增一个名为GetEmployeeImage.aspx的页面,在Page_Load里写上一段代码。我写好的代码如下:
<%@ Page Language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">

    
protected void Page_Load(object sender, EventArgs e)
    
{
        
string strEmployeeID = Request.QueryString["ID"];
        
if (strEmployeeID == null)
        
{
            
return;
        }


        SqlConnection con 
= new SqlConnection(WebConfigurationManager.ConnectionStrings["Northwind"].ConnectionString);
        SqlCommand cmd 
= new SqlCommand("select Photo from Employees where EmployeeID=" + strEmployeeID, con);
        con.Open();
        
byte[] buffer = (byte[])cmd.ExecuteScalar();
        con.Close();
        Response.BinaryWrite(buffer);
        Response.End();
    }

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    
<title>Untitled Page</title>
</head>
<body>
    
<form id="form1" runat="server">
    
<div>
    
    
</div>
    
</form>
</body>
</html>

步骤四:修改步骤二中(在文件default.aspx中)所设定的模板列, 代码如下:
 <asp:TemplateField HeaderText="Picture">
                    
<EditItemTemplate>
                        
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
                    
</EditItemTemplate>
                    
<ItemTemplate>
                        <asp:Image ID="Image1" runat="server" ImageUrl='<%# "GetEmployeeImage.aspx?ID=" + Eval("EmployeeID") %>'/>
                    </ItemTemplate>
                
</asp:TemplateField>

最终default.aspx的代码如下:
<%@ Page Language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    
<title>Untitled Page</title>
</head>
<body>
    
<form id="form1" runat="server">
    
<div>
        
<asp:SqlDataSource ID="employeeDataSource" runat="server" ConnectionString="<%$ ConnectionStrings:Northwind %>"
            SelectCommand
="SELECT [EmployeeID], [LastName], [FirstName], [Photo], [Country] FROM [Employees]">
        
</asp:SqlDataSource>
    
    
</div>
        
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataKeyNames="EmployeeID"
            DataSourceID
="employeeDataSource" Height="172px" Width="335px">
            
<Columns>
                
<asp:BoundField DataField="EmployeeID" HeaderText="EmployeeID" InsertVisible="False"
                    ReadOnly
="True" SortExpression="EmployeeID" />
                
<asp:BoundField DataField="LastName" HeaderText="LastName" SortExpression="LastName" />
                
<asp:BoundField DataField="FirstName" HeaderText="FirstName" SortExpression="FirstName" />
                
<asp:BoundField DataField="Country" HeaderText="Country" SortExpression="Country" />
                
<asp:TemplateField HeaderText="Picture">
                    
<EditItemTemplate>
                        
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
                    
</EditItemTemplate>
                    
<ItemTemplate>
                        
<asp:Image ID="Image1" runat="server" ImageUrl='<%# "GetEmployeeImage.aspx?ID=" + Eval("EmployeeID") %>'/>
                    
</ItemTemplate>
                
</asp:TemplateField>
            
</Columns>
        
</asp:GridView>
    
</form>
</body>
</html>


步骤五:将default.aspx设为启动页之后运行,在浏览器中查看结果如下:



附:
web.config中所做的修改:
1.
 <connectionStrings>
  <add name="Northwind" connectionString="Data Source=cc;Initial Catalog=Northwind;Integrated Security=True" providerName="System.Data.SqlClient"/>
 </connectionStrings>

2.  
  <pages>
      <namespaces>
        <add namespace="System.Data.SqlClient"/>
        <add namespace="System.Web.Configuration"/>
      </namespaces>
    </pages>
posted on 2005-12-14 16:47  楚潇  阅读(2235)  评论(3编辑  收藏  举报