判斷DataRow的列是否被修改過
阿新 • • 發佈：2019-01-26
DataRowState可以檢查資料行有沒有修改，好像沒有找到直接的方法判斷資料列是否被修改過，自己寫一個檢查。
- privatebool isColumnChanged(DataRow dr,int columnIndex)
- {
- if (dr.RowState == DataRowState.Unchanged)
- {
- System.Console.WriteLine("datarow is unchanged.");
- returnfalse;
- }
- elseif ((dr.HasVersion(DataRowVersion.Original)) && dr[columnIndex, DataRowVersion.Default] == dr[columnIndex, DataRowVersion.Original])
- {
- System.Console.WriteLine("default value equals original value");
- returnfalse;
- }
- else
- {
- System.Console.WriteLine("column " + columnIndex + " is changed.");
- returntrue;
- }
- }
- privatevoid button4_Click(object sender, EventArgs e)
- {
- SqlConnection conn = new SqlConnection();
- conn.ConnectionString = "Persist Security Info=False;Integrated Security=SSPI;Initial Catalog=pubs;server=(local)";
- SqlDataAdapter da = new SqlDataAdapter("select * from authors", conn);
- conn.Open();
- DataTable dt = new DataTable();
- da.Fill(dt);
- conn.Close();
- //dataGridView1.AutoGenerateColumns = true;
- //dataGridView1.DataSource = dt;
- DataRow dr = dt.Rows[0] ;
- dr[0] = 999;
- isColumnChanged(dr, 0);//true
- isColumnChanged(dr, 1);//false
- }