在运行时，将X个带有SelectedItem的组合框添加到DataGrid（WPF） [英] At Runtime Add X number of ComboBoxes with SelectedItem to DataGrid (WPF)

问题描述

我想在 DataGrid 中创建整行的 ComboBoxes 。我在以下方面取得了一些进展：

I would like to create an entire row of ComboBoxes in a DataGrid. I have made some progress with the following:

// Declare it
private DataGridComboBoxColumn CreateCustomComboBoxDataSouce(string ColumnName) 
{
    string[] data = { "Date", "LEInt", "String" };
    DataGridComboBoxColumn dgCmbCol = new DataGridComboBoxColumn();
    dgCmbCol.Header = ColumnName;
    dgCmbCol.ItemsSource = data;
    return dgCmbCol;
}

// Later somewhere you can add this to create 20 columns:
for (int i = 0; i < 20; i++)
{
  DataGridComboBoxColumn newColumn = CreateCustomComboBoxDataSouce("Column-" +i);
}
// Sadly nothing is shown unless you manually specify a new row and an
// extra column as done here below, but then you get an extra column.
DataTable table = new DataTable();
table.Columns.Add("|", typeof(string));
table.Rows.Add("");
DataGridCombo.DataContext = table;

XAML保持最小：

<DataGrid x:Name="DataGridCombo" ItemsSource="{Binding}"   Margin="0,0,0,0" />

是否可以设置默认的 SelectedValue ComboBox 中的>？在我的 for 循环中，我确实可以访问所需的设置。另外，有没有一种方法可以显示它而不添加额外的列呢？此DataGrid与另一个没有该额外列的 DataGrid 对齐。

Is there a way to set the default SelectedValue of each ComboBox? Within my for loop I do have access to the desired setting. Also, is there a way to git it to show without adding the extra column? This DataGrid is being lined up with another DataGrid that won't have that extra column.

推荐答案

在解决了很多问题之后，我最终得出一个结论，即我试图做的事情要么是不可能的，要么是不合理的。我改为使用水平方向的 StackPanel 。以下是相关的摘要：

After a lot of working around the issue, I eventually came to the conclusion that what I was trying to do was either not possible, or unreasonable. I changed to using a StackPanel with horizontal orientation. Here are the relevant snippets:

//XAML Layout
<StackPanel Orientation="Horizontal" VerticalAlignment="Top" Name="ComboBoxPanel"  Grid.Row="1"  Margin="0,0,0,0"  HorizontalAlignment="Left" />

//Function to create new box and set options
private ComboBox CreateComboBox(string ColumnName, string selectedItem, int width)
{
    string[] data = { "Date", "LEInt", "String" };

    ComboBox dgCmbCol = new ComboBox();
    dgCmbCol.ItemsSource = data;
    dgCmbCol.Name = ColumnName;
    dgCmbCol.Width = width;
    dgCmbCol.SelectedItem = selectedItem;
    dgCmbCol.SelectionChanged += DataTypeSelectionChanged;
    return dgCmbCol;
}

// This reads a JSON file and uses it's options to set the width of all the columns
// for the DataGrid and matches the ComboBoxes to it so they all line up
dynamic TableData = JsonConvert.DeserializeObject(Config.DataLayoutDefinition);
ComboBoxPanel.Children.Clear(); //Since this is run on user interaction, clear old contents.

for (int i = 0; i <  DataGridView.Columns.Count; i++)
{
    int width = TableData.data[i].ColumnWidth;
    if (TableData.data[i].DataType == "String")
    {
        width = 125;
    }
    else if (TableData.data[i].DataType == "Date")
    {
        width = 150;
    }
    else if (TableData.data[i].DataType == "LEInt")
    {
        width = 80;
    }
    else
    {
        width = 100;
    }
ComboBoxPanel.Children.Add(CreateComboBox(TableData.data[i].Column.ToString(), TableData.data[i].DataType.ToString(), width));
    DataGridView.Columns[i].Width = width;

}

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