在datagridview内的组合框中设置值 [英] set value in combobox inside datagridview

问题描述

我有带组合框的Datagridview，我无法在代码
中设置索引，我读了此和此 -两者都不起作用。

I Have Datagridview with combobox inside and i can't set the index in code I read this and this - both not work.

这是我的代码：

  dgShuffle.DataSource = dtCards;
  DataGridViewComboBoxColumn cmb = new DataGridViewComboBoxColumn();
  cmb.HeaderText = "Select Data";
  cmb.Name = "cmb";
  cmb.MaxDropDownItems = 2;
  cmb.Items.Add("real");
  cmb.Items.Add("sham");

  dgShuffle.Columns.Add(cmb);
  for (int i = 0; i < dgShuffle.RowCount; i++)
  {
       (dgShuffle.Rows[i].Cells[6] as DataGridViewComboBoxCell).Value = "real";
        // dgShuffle.Rows[i].Cells[6].Value = "real";
  }

要设置代码，我的意思是：以编程方式设置（取决于datatble中的值） 。
我根本不出错。该值根本不会显示在组合框中

To set by code i mean : programmatically (depend on the value in datatble). I Dont Get error at all. the value simply not display in the combobox

我检查了组合框的索引，这是正确的，在我即时窗口的输出下方：

I checked the index of the combobox and this is correct , below the output from my immediate window:

？dgShuffle.Rows [i] .Cells [6]

?dgShuffle.Rows[i].Cells[6]

{DataGridViewComboBoxCell {ColumnIndex = 6，RowIndex = 0}} [System.Windows.Forms.DataGridViewComboBoxCell]：{DataGridViewComboBoxCell {ColumnIndex = 6，RowIndex = 0}}
基数：{DataGridViewComboBoxCell {ColumnIndex = 6，RowIndex = 0}}
AccessibilityObject： {System.Windows.Forms.DataGridViewCell.DataGridViewCellAccessibleObject}}
ColumnIndex：6
ContentBounds：{X = 0 Y = 12宽度= 0高度= 0}
ContextMenuStrip：空
DefaultNewRowValue ：空
显示：否
EditedFormattedValue：
EditType：{Name = DataGridViewComboBoxEditingControl FullName = System.Windows.Forms.DataGridViewComboBoxEditingControl}
ErrorIconBounds：{X = 0 Y = 0智慧h = 0高度= 0}
ErrorText：
FormattedValue：
FormattedValueType：{Name = String FullName = System.String}
冻结：false
HasStyle：否
InheritedState：可调整大小| ResizableSet |可见的
InheritedStyle：{DataGridViewCellStyle {BackColor = Color [Window]，ForeColor = Color [ControlText]，SelectionBackColor = Color [Highlight]，SelectionForeColor = Color [HighlightText]，Font = [字体：名称= Microsoft Sans Serif，大小= 7.8，单位= 3，GdiCharSet = 177，GdiVerticalFont = False]，WrapMode = False，Alignment = MiddleLeft}}
IsInEditMode：false
OwningColumn：{DataGridViewComboBoxColumn {Name = cmb，Index = 6}}
OwningRow：{DataGridViewRow {Index = 0}}
PreferredSize：{Width = 43 Height = 26}
ReadOnly：false
可调整大小：true
RowIndex：0
选中：false
大小：{Width = 100 Height = 24}
样式：{DataGridViewCellStyle {}}
标签：null
ToolTipText：
值：空
值类型：{Name = Object FullName = System.Object}
可见：true

{DataGridViewComboBoxCell { ColumnIndex=6, RowIndex=0 }} [System.Windows.Forms.DataGridViewComboBoxCell]: {DataGridViewComboBoxCell { ColumnIndex=6, RowIndex=0 }} base: {DataGridViewComboBoxCell { ColumnIndex=6, RowIndex=0 }} AccessibilityObject: {System.Windows.Forms.DataGridViewCell.DataGridViewCellAccessibleObject} ColumnIndex: 6 ContentBounds: {X = 0 Y = 12 Width = 0 Height = 0} ContextMenuStrip: null DefaultNewRowValue: null Displayed: false EditedFormattedValue: "" EditType: {Name = "DataGridViewComboBoxEditingControl" FullName = "System.Windows.Forms.DataGridViewComboBoxEditingControl"} ErrorIconBounds: {X = 0 Y = 0 Width = 0 Height = 0} ErrorText: "" FormattedValue: "" FormattedValueType: {Name = "String" FullName = "System.String"} Frozen: false HasStyle: false InheritedState: Resizable | ResizableSet | Visible InheritedStyle: {DataGridViewCellStyle { BackColor=Color [Window], ForeColor=Color [ControlText], SelectionBackColor=Color [Highlight], SelectionForeColor=Color [HighlightText], Font=[Font: Name=Microsoft Sans Serif, Size=7.8, Units=3, GdiCharSet=177, GdiVerticalFont=False], WrapMode=False, Alignment=MiddleLeft }} IsInEditMode: false OwningColumn: {DataGridViewComboBoxColumn { Name=cmb, Index=6 }} OwningRow: {DataGridViewRow { Index=0 }} PreferredSize: {Width = 43 Height = 26} ReadOnly: false Resizable: true RowIndex: 0 Selected: false Size: {Width = 100 Height = 24} Style: {DataGridViewCellStyle { }} Tag: null ToolTipText: "" Value: null ValueType: {Name = "Object" FullName = "System.Object"} Visible: true

下一次尝试：

Next try :

1. 我创建了一个新的Winfo rms项目


2. 将datagridview拖动到默认表单（从工具箱中）



3. 将此代码复制到Form1_Load：

1. I create a new winforms project
2. Drag datagridview to the default form (from the toolbox)

3. Copy this code to Form1_Load :

    DataTable dtCards;
    dtCards = new DataTable();
    dtCards.Columns.Add("printedString");
    dtCards.Rows.Add("1");
    dtCards.Rows.Add("2");
    dtCards.Rows.Add("3");
    dtCards.Rows.Add("4");
    dataGridView1.DataSource = dtCards;

    DataGridViewComboBoxColumn cmb = new DataGridViewComboBoxColumn();
    cmb.HeaderText = "Select Data";
    cmb.Name = "cmb";
    cmb.MaxDropDownItems = 2;
    cmb.Items.Add("real");
    cmb.Items.Add("sham");

    dataGridView1.Columns.Add(cmb);
    for (int i = 0; i < dataGridView1.RowCount; i++)
    {
        (dataGridView1.Rows[i].Cells[6] as DataGridViewComboBoxCell).Value = "real";
        // dgShuffle.Rows[i].Cells[6].Value = "real";
    }

我想念的是什么

推荐答案

您正在使用绑定到数据源的datagridview。您需要在数据源中指定该值。

You are using datagridview bounded to the data source. You need specify that value in the datasource.

为数据源中的 DataGridViewComboBoxColumn 添加值

然后将 DataGridViewComboBoxColumn.DataPropertyName 设置为数据源的列/属性的名称

Add value for DataGridViewComboBoxColumn in the data source
Then set DataGridViewComboBoxColumn.DataPropertyName to the name of the column/property of your data source

DataTable dtCards;
dtCards = new DataTable();
dtCards.Columns.Add("printedString");
dtCards.Columns.Add("comboboxValue", typeof(String)); //adding column for combobox
dtCards.Rows.Add("1", "real");
dtCards.Rows.Add("2", "real");
dtCards.Rows.Add("3", "real");
dtCards.Rows.Add("4", "real");


DataGridViewComboBoxColumn cmb = new DataGridViewComboBoxColumn();
cmb.HeaderText = "Select Data";
cmb.Name = "cmb";
cmb.MaxDropDownItems = 2;
cmb.Items.Add("real");
cmb.Items.Add("sham");
cmb.DataPropertyName = "comboboxValue"; //Bound value to the datasource

dataGridView1.Columns.Add(cmb);
dataGridView1.DataSource = dtCards;

这篇关于在datagridview内的组合框中设置值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！