我一直在研究一个问题，我终于弄明白了。我试图在窗体初始化时设置一个控件。我认为控件的值没有被设置是因为控件已经被绘制（如果我错了，请纠正我）。
我的部分表单代码
//in form 1
....
private void button2_Click(object sender, EventArgs e)
{
Form2 form = new Form2();
form.Owner = this;
form.Show(this);
}
....}
public Form2()
{
InitializeComponent();
setData(); //Sets a datagridview's combobox column and databinds a datatable
setGrid(); //Sets each row in the datagridview combobox's value to a string
}
private void setData()
{
gvTest.AllowUserToAddRows = false;
string strConn = "server=10.253.3.185;database=petersun-test1;user id=ctore;password=cqi$$;connection timeout=30";
SqlConnection conn = new SqlConnection(strConn);
DataTable dit = new DataTable();
try
{
conn.Open();
string sql = "SELECT LTRIM(RTRIM(COLUMN_NAME)) as ColumnName from INFORMATION_SCHEMA.COLUMNS where Table_Name='coproc' order by ORDINAL_POSITION";
SqlCommand cmd = new SqlCommand(sql, conn);
SqlDataAdapter da = new SqlDataAdapter(cmd);
da.Fill(dit);
DataGridViewComboBoxColumn dcDatabasefields = new DataGridViewComboBoxColumn();
dcDatabasefields.DataPropertyName = "ColumnName";
dcDatabasefields.HeaderText = "Database Field Name";
dcDatabasefields.Name = "dbFields";
dcDatabasefields.DisplayMember = "ColumnName";
dcDatabasefields.ValueMember = "ColumnName";
dcDatabasefields.Width = 200;
BindingSource bsourceFields = new BindingSource();
bsourceFields.DataSource = dit;
dcDatabasefields.DataSource = bsourceFields;
dcDatabasefields.DataSource = dit; // bsourceFields;
gvTest.Columns.Add(dcDatabasefields);
}
finally
{
conn.Close();
}
DataTable dt = new DataTable();
DataColumn dc = new DataColumn("options");
dt.Columns.Add(dc);
DataRow dr = dt.NewRow();
dr["options"] = "A";
dt.Rows.Add(dr);
dr = dt.NewRow();
dr["options"] = "C";
dt.Rows.Add(dr);
dr = dt.NewRow();
dr["options"] = "D";
dt.Rows.Add(dr);
dr = dt.NewRow();
dr["options"] = "E";
dt.Rows.Add(dr);
gvTest.DataSource = dt;
}
private void setGrid()
{
foreach(DataGridView Row in gvGrid.Rows)
{
Row.Cells[0].Value = "string";
}
}
所以我认为正在发生的是： 1. 组件正在初始化 2. 使用列创建 datagridview 3. 设置列值 4. 绘制表单
我的想法正确吗？我的问题是我应该设置控件的值是什么表单事件？我做了一些研究，我正在考虑 PAINT 事件，但我也不确定。有人可以详细解释表格的生命周期或指出我的某个地方。谢谢