C#一些经常忘的小东西

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1 窗体中的 comboBox

comboBox1.DataSource = dt_com;

comboBox1.DisplayMember = "Buyer";

comboBox1.ValueMember = "Id";

2给dataGridView赋值，其中有自定义的列

dt_umd = tu.SelectAll("order by id");
DataTable dt = new DataTable();//新建的表

dt.Columns.Add("id", Type.GetType("System.String"));
dt.Columns.Add("address", Type.GetType("System.String"));
dt.Columns.Add("com", Type.GetType("System.String"));
dt.Columns.Add("version", Type.GetType("System.String"));
dt.Columns.Add("yuanming", Type.GetType("System.String"));

for (int i = 0; i < dt_umd.Rows.Count; i++)
{
DataRow dr = dt.NewRow();
dr["id"] = dt_umd.Rows[i]["id"];
dr["address"] = dt_umd.Rows[i]["address"];
dr["com"] = dt_umd.Rows[i]["com"];
dr["version"] = dt_umd.Rows[i]["version"];

dt_sn = ts.SelectAll("and id=" + dt_umd.Rows[i]["sId"].ToString() + "");
if (dt_sn.Rows.Count > 0)
{
dr["yuanming"] = dt_sn.Rows[0]["name"].ToString();
}
else
{
dr["yuanming"] = "";
}
dt.Rows.Add(dr);
}

dataGridView1.DataSource = dt.DefaultView;

3 dataGridView 右键选择行中的哪列值

string name = "";
DataGridViewSelectedRowCollection dgvsrow = dataGridView1.SelectedRows;
foreach (DataGridViewRow dgvr in dgvsrow)
{
name = dgvr.Cells["id"].Value.ToString();
}