DataGridView CheckBox Column - 显示 CheckBox 但存储字符串

Question

这是我的代码：

public partial class Form1 : Form
{
    SqlCommandBuilder cmbl;
    string con = "Data Source=localhost;Initial Catalog=db;Persist Security Info=True;User ID=sa;Password=1234";
    SqlDataAdapter sdaHFP;
    string QueryDgvHFP = "SELECT * FROM HFP";
    DataTable dtHFP;
    SqlConnection cn;

    public Form1()
    {
        InitializeComponent();
    }
    private void Form1(object sender, EventArgs e) 
    {
        sdaHFP = new SqlDataAdapter(QueryDgvHFP, con);
        dtHFP = new DataTable();
        sdaHFP.Fill(dtHFP);

        foreach (DataRow item in dtHFP.Rows)
        {
            int n = dgvHFP.Rows.Add();
            dgvHFP.Rows[n].Cells[0].Value = item["HFP"].ToString();
            dgvHFP.Rows[n].Cells[1].Value = item["YearPeriod"].ToString();
            if (item["Active"].ToString() == "Y")
            {
                dgvHFP.Rows[n].Cells[2].Value = true;
            }
            else
            {
                dgvHFP.Rows[n].Cells[2].Value = false;
            };
            dgvHFP.Rows[n].Cells[3].Value = item["ID"].ToString();
        }
    }

这是将数据从 Sql Query 加载到 DataGridView，我在此代码中添加了一个用于执行更新或插入的按钮：

private void btUpdate_Click(object sender, EventArgs e)
{
    try
    {
        cmbl = new SqlCommandBuilder(sdaHFP);
        sdaHFP.Update(dtHFP);
        MessageBox.Show("Success", "Update", MessageBoxButtons.OK, MessageBoxIcon.Information);
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
    }
}

当我在DataGridView 中更新/插入数据并单击该更新按钮时，会出现一个成功消息框，但数据库中的数据既未更新也未插入

请帮我解决这个问题，为什么更新按钮不起作用？

非常感谢。

Answer 1

您应该将DataGridView 绑定到DataTable，然后当您更改单元格值或添加或删除行时，更改将应用​​于DataTable。然后您可以使用TableAdapter 保存数据表更改：

this.dataGridView1.DataSource = dataTable;

注意：要存储true/false或Yes/No值，最好在sql server中使用bit数据类型。但在下面的示例中，我假设您需要将值存储为 Y/N 为 nvarchar(50)，并且我设置了 DataGridViewCheckBoxColumn 以支持编辑字符串列。

示例

假设我们有一张桌子Table1:

Column1: int, primary key
Column2: nvarchar(50), Allows Null, Containing Y or N as vaule

我们想在DataGridView 中编辑Table1 的数据：

这里是您可以用来加载、编辑和保存数据的代码：

private DataTable table; 
private SqlDataAdapter dataAdapter;

private void sampleForm_Load(object sender, EventArgs e)
{
    var command = "SELECT * FROM Table1";
    var connection = @"Your connection string";
    table = new DataTable();
    dataAdapter = new SqlDataAdapter(command, connection);
    var commandBuilder = new SqlCommandBuilder(dataAdapter);
    dataAdapter.Fill(table);

    //Set false as default value for Column2
    table.Columns["Column2"].DefaultValue = false;

    var column1 = new DataGridViewTextBoxColumn();
    column1.Name = "Column1";
    column1.DataPropertyName = "Column1";

    var column2 = new DataGridViewCheckBoxColumn();
    column2.Name = "Column2";
    column2.DataPropertyName = "Column2";
    column2.TrueValue = "Y";
    column2.FalseValue = "N";

    this.dataGridView1.Columns.Add(column1);
    this.dataGridView1.Columns.Add(column2);

    //Bind grid to table
    this.dataGridView1.DataSource = table;
}

private void saveButton_Click(object sender, EventArgs e)
{
    //Save data
    this.dataGridView1.EndEdit();
    dataAdapter.Update(table);
}