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DataTable table = new DataTable();
table = db.selectTable(DBName, TableName);
if(table.Columns.Count>0)
{
dataGridView1.DataSource = table;
dataGridView1.AutoGenerateColumns = true;
dataGridView1.Columns[a].DataPropertyName = "ColumnName";//这个你应该知道是什么字段名称啊 直接填字段名称就好了吧!
dataGridView1.Columns[a].HeaderText = "ColumnName";
dataGridView1.Columns[a].Visible = true;
}