使用参数的水晶报告

Question

我第一次使用水晶报告。我已经写代码如下所示

public partial class _Default : System.Web.UI.Page 
{ 
    private ReportDocument report = new ReportDocument(); 
    protected void Page_Load(object sender, EventArgs e) 
    { 
     report.Load(Server.MapPath("CrystalReport1.rpt")); 
     report.FileName = Server.MapPath("CrystalReport1.rpt"); 
     if (!Page.IsPostBack) 
      { 
       BindData(); 
      } 
    } 

protected override void OnUnload(EventArgs e) 
{ 
    base.OnUnload(e); 
    this.Unload+=new EventHandler(Page_Unload); 
} 

    public void Page_Unload(object sender, EventArgs e) 
    { 
     report.Clone(); 
     report.Dispose(); 
    } 

private void BindData() 
    {   
     Trusted_Connection=true"; 
     string connectionString = @"Data Source=WINSERVER;Initial Catalog=card;User  ID=sa;Password = db2admin"; 
     SqlConnection myConnection = new SqlConnection(connectionString); 
     SqlDataAdapter ad = new SqlDataAdapter("SELECT name,address,idno FROM iffcar", myConnection); 
     DataSet ds = new DataSet(); 
     ad.Fill(ds); 
     DropDownList1.DataSource = ds; 
     DropDownList1.DataTextField = "name"; 
     DropDownList1.DataValueField = "idno"; 
     DropDownList1.DataBind(); 
    } 


protected void Btn_DisplayReport(object sender, EventArgs e) 
    { 

    int idno = Convert.ToInt32(DropDownList1.SelectedValue); 
    report.SetParameterValue("idno", idno); 
    CrystalReportViewer1.ReportSource = report; 
    } 
} 

我在下拉列表获取值，但

现在我的问题是，一旦我选择下拉列表我想，值报告的值。 怎么办呢.....

请帮我解决我的问题。

Answer 1

尝试使用的参数的索引号：

protected void Btn_DisplayReport(object sender, EventArgs e) 
{ 
    int idno = Convert.ToInt32(DropDownList1.SelectedValue); 
    report.SetParameterValue(0, idno); 
    CrystalReportViewer1.ReportSource = report; 
}