如何从 ComboBox C# Winforms 获取 ValueMember 值？
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/15982929/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
How to get ValueMember value from ComboBox C# Winforms?
提问by bbcompent1
I'm having some trouble trying to get the ValueMember value I've set. I'm trying to use a combobox to select a windows forms report. I can get the Name but not RptValue. Here's my code:
我在尝试获取我设置的 ValueMember 值时遇到了一些麻烦。我正在尝试使用组合框来选择 Windows 窗体报告。我可以得到名称，但不能得到 RptValue。这是我的代码：
private class Data
{
public string Name { get; set; }
public string RptValue { get; set; }
}
private void BaseForm_Load(object sender, EventArgs e)
{
this.rvDoctorReportViewer.RefreshReport();
comboBox1.Items.Add(new Data { Name="Select", RptValue="Select"});
comboBox1.Items.Add(new Data { Name = "All Food Values", RptValue = "AllFoodValues.rdlc" });
comboBox1.Items.Add(new Data { Name = "All Readings", RptValue = "AllReadings.rdlc" });
comboBox1.Items.Add(new Data { Name = "Avg Food Values by Date", RptValue = "AvgFoodValuesByDate.rdlc" });
comboBox1.Items.Add(new Data { Name = "Avg Food Values by Meal", RptValue = "AvgFoodValuesByMeal.rdlc" });
comboBox1.Items.Add(new Data { Name = "Avg Readings by Date", RptValue = "AvgReadingsByDate.rdlc" });
comboBox1.Items.Add(new Data { Name = "Avg Readings by Time", RptValue = "AvgReadingsByTime.rdlc" });
comboBox1.Items.Add(new Data { Name = "Avg Readings by Event", RptValue = "AvgReadingsByEvent.rdlc" });
comboBox1.Items.Add(new Data { Name = "Blood Pressure Chart", RptValue = "BPChart.rdlc" });
comboBox1.Items.Add(new Data { Name = "Blood Pressure Report", RptValue = "BPReport.rdlc" });
comboBox1.Items.Add(new Data { Name = "Detail Food Values by Meal", RptValue = "DetailFoodValuesByMeal.rdlc" });
comboBox1.Items.Add(new Data { Name = "Doctor Detail Report", RptValue = "DoctorDetailReport.rdlc" });
comboBox1.Items.Add(new Data { Name = "Food Chart", RptValue = "FoodChart.rdlc" });
comboBox1.Items.Add(new Data { Name = "Pumper Detail Report", RptValue = "PumperDetailReport.rdlc" });
comboBox1.Items.Add(new Data { Name = "Reading Charts", RptValue = "ReadingCharts.rdlc" });
comboBox1.Items.Add(new Data { Name = "Total Daily Food Intake", RptValue = "TotalIntakeDailyFood.rdlc" });
comboBox1.DisplayMember = "Name"; // This works fine
comboBox1.ValueMember = "RptValue"; // This is the problem. It renders as RptValue instead of the value
comboBox1.SelectedIndex = 0;
}
private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
if (comboBox1.SelectedIndex > 0)
{
string strReport;
strReport = "ReportViewer." + comboBox1.ValueMember.ToString();
rvDoctorReportViewer.Reset();
rvDoctorReportViewer.LocalReport.ReportEmbeddedResource = strReport;
this.rvDoctorReportViewer.RefreshReport();
}
}
采纳答案by MAV
You should use the DataSourceproperty. Try this:
您应该使用该DataSource属性。尝试这个：
BindingList<Data> _comboItems = new BindingList<Data>();
_comboItems.Add(new Data { Name = "Select", RptValue = "Select" });
_comboItems.Add(new Data { Name = "All Food Values", RptValue = "AllFoodValues.rdlc" });
...
comboBox1.DataSource = _comboItems;
comboBox1.DisplayMember = "Name";
comboBox1.ValueMember = "RptValue";
And then access the selected value:
然后访问选定的值：
strReport = "ReportViewer." + comboBox1.SelectedValue;
回答by Hyman ghaleb
String s;
s=comboBox1.SelectedValue.tostring()
回答by ccp
This worked for me:
这对我有用：
combobox.valuemember="id"
combobox.displaymember="name"
combobox.datasource=dt
