如何从组合框传递参数以将devexpress XtraReport传递给 [英] How to pass parameters to devexpress XtraReport from combobox

问题描述

我有一个包含3个组合框和一个如下所示的按钮的表单

I have a form that contains 3 comboboxes and a button like shown below

和一个包含3个绑定到RTF的参数的报告

and a report that containes 3 parameters that are bounded to richtext

在单击打印"按钮时，我在此过程中使用了以下代码，但未传递参数，并且RTF文本字段为空

i used the following code for this process when clicking the button Print but parameters aren't passed and richtext fields are empty

private void btnPrint_Click(object sender, EventArgs e)
{
    // Create a report instance.
    var report = new XtraReport1();

    // Obtain a parameter, and set its value.
    report.ClassName.Value    = cmbClass.SelectedText;
    report.SubclassName.Value = cmbDivision.SelectedText;
    report.StudentName.Value  = cmbStudent.SelectedText;

    report.RequestParameters = false;    // Hide the Parameters UI from end-users.
    report.ShowPreview();
}

推荐答案

使用XtraReport.Parameters集合将组合框值传递给参数名称，如下例所示:

Use XtraReport.Parameters collection to pass combobox values into parameter names as shown in below example:

private void btnPrint_Click(object sender, EventArgs e)
{
    // Create a report instance.
    var report = new XtraReport1();

    // Obtain a parameter, and set its value.
    report.Parameters["ClassName"].Value = cmbClass.SelectedText;
    report.Parameters["SubclassName"].Value = cmbDivision.SelectedText;
    report.Parameters["StudentName"].Value = cmbStudent.SelectedText;

    report.RequestParameters = false; // Hide the Parameters UI from end-users.
    report.ShowPreview();
}

或者您可以声明一个重载构造函数，该重载构造函数在其中分配参数值，然后使用重载构造函数参数创建XtraReport实例:

Or you may declare an overload constructor which assigns parameter values inside it, then create XtraReport instance using overloaded constructor arguments:

// XtraReport
public partial class ReportName : DevExpress.XtraReports.UI.XtraReport
{
    // default parameterless constructor here

    public ReportName(string ClassName, string SubclassName, string StudentName)
    {
        InitializeComponent();

        this.Parameters["ClassName"].Value = ClassName;
        this.Parameters["SubclassName"].Value = SubclassName;
        this.Parameters["StudentName"].Value = StudentName;
    }
}

// Form code
private void btnPrint_Click(object sender, EventArgs e)
{
    // Create a report instance.
    var report = new XtraReport1(cmbClass.SelectedText, cmbDivision.SelectedText, cmbStudent.SelectedText);

    report.RequestParameters = false; // Hide the Parameters UI from end-users.
    report.ShowPreview();
}

参考:在运行时传递参数值

更新:

如果每个文本框的SelectedText属性始终为空值，则可以使用Text或SelectedItem属性获取组合框的实际值(类似问题

If SelectedText property for each textbox always have null value, you can use Text or SelectedItem property to get actual combo box value (similar issue here).

private void btnPrint_Click(object sender, EventArgs e)
{
    // Create a report instance.
    var report = new XtraReport1();

    // Obtain a parameter, and set its value.
    report.Parameters["ClassName"].Value = cmbClass.Text;
    report.Parameters["SubclassName"].Value = cmbDivision.Text;
    report.Parameters["StudentName"].Value = cmbStudent.Text;

    report.RequestParameters = false; // Hide the Parameters UI from end-users.
    report.ShowPreview();
}

这篇关于如何从组合框传递参数以将devexpress XtraReport传递给的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！