我有以下的GridView:麻烦从GridView控件
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataKeyNames="SysInvoiceID" DataSourceID="SqlDataSource1">
<Columns>
<asp:BoundField DataField="SysInvoiceID" HeaderText="SysInvoiceID" ReadOnly="True" SortExpression="SysInvoiceID" />
<asp:BoundField DataField="BillMonth" HeaderText="BillMonth" SortExpression="BillMonth" />
<asp:BoundField DataField="InvoiceDate" HeaderText="InvoiceDate" ReadOnly="True" SortExpression="InvoiceDate" />
<asp:BoundField DataField="InvoiceNumber" HeaderText="InvoiceNumber" SortExpression="InvoiceNumber" />
<asp:BoundField DataField="Net" HeaderText="Net" SortExpression="Net" />
<asp:BoundField DataField="VAT" HeaderText="VAT" SortExpression="VAT" />
<asp:BoundField DataField="Gross" HeaderText="Gross" SortExpression="Gross" />
<asp:ButtonField CommandName="ViewInvoice" HeaderText=" " ShowHeader="True" Text="View" />
</Columns>
</asp:GridView>
这里是代码隐藏页:
public partial class PagingTest01 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
void GridView1_RowCommand(Object sender, GridViewCommandEventArgs e)
{
// If multiple buttons are used in a GridView control, use the
// CommandName property to determine which button was clicked.
if (e.CommandName == "ViewInvoice")
{
// Convert the row index stored in the CommandArgument
// property to an Integer.
int index = Convert.ToInt32(e.CommandArgument);
// Retrieve the row that contains the button clicked
// by the user from the Rows collection.
GridViewRow row = GridView1.Rows[index];
// Now you have access to the gridviewrow.
ViewButton_Click(row);
}
}
protected void ViewButton_Click(GridViewRow row)
{
byte[] FileImage = GetImageData(0,row);
if (FileImage != null)
{
base.Response.Clear();
base.Response.Buffer = true;
base.Response.ContentType = "Application/x-pdf";
base.Response.ContentEncoding = Encoding.Default;
string attachment = string.Format("attachment;filename=\"Invoice_{0}.pdf\"", "Customer1");
base.Response.AddHeader("content-disposition", attachment);
base.Response.BinaryWrite(FileImage);
base.Response.Flush();
base.Response.Close();
base.Response.End();
}
}
public byte[] GetImageData(int sysInvoiceID, GridViewRow row)
{
string strUserID = CommonCode.GetCurrentUserID().ToString();
string strCustomerID = CommonCode.GetCurrentCustomerID().ToString();
byte[] numArray;
string strConnectionString = "Data Source=TESTSERV;Initial Catalog=DB_Invoices;Persist Security Info=True";
SqlConnection connection = new SqlConnection(strConnectionString);
SqlCommand command = new SqlCommand("select FileImage from DB_Invoices.dbo.Bills WHERE (FileType = 'PDF' AND SysInvoiceID = @ID)", connection);
command.Parameters.AddWithValue("@ID", GridView1.Rows[row].Cells[0].Text);
SqlDataAdapter da = new SqlDataAdapter(command);
DataSet ds = new DataSet();
try
{
connection.Open();
da.Fill(ds);
DataRow item = ds.Tables[0].Rows[0];
byte[] item1 = (byte[])item["FileImage"];
ds.Tables.Clear();
numArray = item1;
}
catch (Exception ex)
{
throw ex;
}
finally
{
connection.Close();
}
return numArray;
}
}
所以基本上我有很多行的GridView控件,每一个在其旁边有一个“查看”按钮。点击'View'时,我试图使用GridView1_RowCommand,它应该在传递到ViewButton_Click之前获取点击的行。然后这将调用GetImageData并通过行号到该行:
command.Parameters.AddWithValue("@ID", GridView1.Rows[row].Cells[0].Text);
细胞0是SysInvoiceID列,因此,如果正确的行通过,@ID将被分配一个SysInvoiceID。
然而,'行'似乎并不是一个有效的参数,但我想不出为什么不... ...除非我必须明确地将其转换为int吗?任何帮助将非常感激!谢谢。
侧面说明的:如果' ID'是一个'int',你应该使用'int.Parse(celltext)',否则数据库会得到错误的类型,因为'AddWithValue'需要从值中推断出类型。 –
只是注意到了一些东西......在代码至少工作之前,如果我明确地键入一个行号如1,但是目前没有任何事情发生。从外观看,我不认为ViewButton_Click被正确调用? – JimmyK