Question

所以我一直在使用DataGridView，用户可以在其中更改一行中一个单元格的值，然后将同一行上另一个单元格的类型更改为DataGridViewComboBoxCell或返回DataGridViewTextBoxCell。我可以让组合框显示出来。

Dictionary<long, string> InspectionTools = new Dictionary<long, string>();

private void DynamicControlsDGV_CellValueChanged(object sender, DataGridViewCellEventArgs e)
{
    if (DynamicControlsDGV.Columns[e.ColumnIndex].Name == "typeDataGridViewTextBoxColumn")
    {
        var type = int.Parse(DynamicControlsDGV[1, e.RowIndex].Value.ToString());
        if (type == 8)
        {
            var CBCell = new DataGridViewComboBoxCell();
            CBCell.DataSource = InspectionTools.ToList();
            CBCell.ValueMember = "Key";
            CBCell.DisplayMember = "Value";
            CBCell.DisplayStyle = DataGridViewComboBoxDisplayStyle.ComboBox;
            DynamicControlsDGV[7, e.RowIndex] = CBCell;
        }
        else
        {
            var CBCell = new DataGridViewTextBoxCell();
            DynamicControlsDGV[7, e.RowIndex] = CBCell;
        }
    }
}

然而，即使我在单击组合框单元格时看到所有值，当我选择我想要的那个时，单元格显示值成员（键/ ID）而不是显示成员（值/名称）。如下图所示：

有没有办法可以覆盖单元格格式，这样就不会将显示文本更改回ID？

最小，完整且可验证的示例

制作MCVE后，我发现问题出在我的代码中的其他地方。这是我作为参考的MSVE（工作得非常好）：

代码背后：

public partial class Form1 : Form
{
    public List<KeyValuePair<long, string>> options2 = new List<KeyValuePair<long, string>>();
    public Form1()
    {
        InitializeComponent();
        var options = new List<KeyValuePair<long, string>>();
        options.Add(new KeyValuePair<long, string>(1, "text"));
        options.Add(new KeyValuePair<long, string>(2, "combo"));

        options2 = new List<KeyValuePair<long, string>>();
        options2.Add(new KeyValuePair<long, string>(1, "option 1"));
        options2.Add(new KeyValuePair<long, string>(2, "option 2"));

        ((DataGridViewComboBoxColumn)dataGridView1.Columns[0]).DataSource = options;
        ((DataGridViewComboBoxColumn)dataGridView1.Columns[0]).ValueMember = "Key";
        ((DataGridViewComboBoxColumn)dataGridView1.Columns[0]).DisplayMember = "Value";
        for (int i = 0; i < 5; i++)
        {
            DataGridViewRow row = (DataGridViewRow)dataGridView1.Rows[0].Clone();
            dataGridView1.Rows.Add(row);
        }
    }

    private void dataGridView1_CellValueChanged(object sender, DataGridViewCellEventArgs e)
    {
        if (e.ColumnIndex==0)
        {
            try
            {
                if (int.Parse(dataGridView1[e.ColumnIndex, e.RowIndex].Value.ToString()) == 2)
                {
                    var CBCell = new DataGridViewComboBoxCell();
                    CBCell.DataSource = options2;
                    CBCell.ValueMember = "Key";
                    CBCell.DisplayMember = "Value";
                    CBCell.DisplayStyle = DataGridViewComboBoxDisplayStyle.ComboBox;
                    dataGridView1[1, e.RowIndex] = CBCell;
                }
                else
                {
                    var CBCell = new DataGridViewTextBoxCell();
                    dataGridView1[1, e.RowIndex] = CBCell;
                }
            }
            catch
            {
            }
        }
    }
}

设计

partial class Form1
{
    /// <summary>
    /// Required designer variable.
    /// </summary>
    private System.ComponentModel.IContainer components = null;

    /// <summary>
    /// Clean up any resources being used.
    /// </summary>
    /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
    protected override void Dispose(bool disposing)
    {
        if (disposing && (components != null))
        {
            components.Dispose();
        }
        base.Dispose(disposing);
    }

    #region Windows Form Designer generated code

    /// <summary>
    /// Required method for Designer support - do not modify
    /// the contents of this method with the code editor.
    /// </summary>
    private void InitializeComponent()
    {
        this.dataGridView1 = new System.Windows.Forms.DataGridView();
        this.Column2 = new System.Windows.Forms.DataGridViewComboBoxColumn();
        this.Column3 = new System.Windows.Forms.DataGridViewTextBoxColumn();
        ((System.ComponentModel.ISupportInitialize)(this.dataGridView1)).BeginInit();
        this.SuspendLayout();
        // 
        // dataGridView1
        // 
        this.dataGridView1.ColumnHeadersHeightSizeMode = System.Windows.Forms.DataGridViewColumnHeadersHeightSizeMode.AutoSize;
        this.dataGridView1.Columns.AddRange(new System.Windows.Forms.DataGridViewColumn[] {
        this.Column2,
        this.Column3});
        this.dataGridView1.Dock = System.Windows.Forms.DockStyle.Fill;
        this.dataGridView1.Location = new System.Drawing.Point(0, 0);
        this.dataGridView1.Name = "dataGridView1";
        this.dataGridView1.Size = new System.Drawing.Size(879, 564);
        this.dataGridView1.TabIndex = 0;
        this.dataGridView1.CellValueChanged += new System.Windows.Forms.DataGridViewCellEventHandler(this.dataGridView1_CellValueChanged);
        // 
        // Column2
        // 
        this.Column2.HeaderText = "2";
        this.Column2.Name = "Column2";
        // 
        // Column3
        // 
        this.Column3.HeaderText = "3";
        this.Column3.Name = "Column3";
        // 
        // Form1
        // 
        this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
        this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
        this.ClientSize = new System.Drawing.Size(879, 564);
        this.Controls.Add(this.dataGridView1);
        this.Name = "Form1";
        this.Text = "Form1";
        ((System.ComponentModel.ISupportInitialize)(this.dataGridView1)).EndInit();
        this.ResumeLayout(false);

    }

    #endregion

    private System.Windows.Forms.DataGridView dataGridView1;
    private System.Windows.Forms.DataGridViewComboBoxColumn Column2;
    private System.Windows.Forms.DataGridViewTextBoxColumn Column3;
}

另一次更新

我将Dictionary从Dictionary更改为Dictionary，因为我的原始示例是将long更改为字符串，因为它所基于的类具有string作为InstrumentName的类型（我正在编辑的列）。因此，单元格中设置的字符串值无法匹配字典中长的键。

Answer 1

数据网格视图基于通过LINQ to SQL创建的类。因此，列类型设置为字符串而不是默认的Object。将组合框的数据源更改为字符串对后，字符串的格式正确。

选择后，DataGridViewComboBoxCell显示Value成员而非Display成员

1 个答案: