最近因為要做資料效能優化，原有的資料通過foreach迴圈插入資料庫，由於每迴圈一次就要和資料庫互動一次，效能非常差，用時很長，在網上查閱了一些資料找到了SqlBulkCopy這個類，在原有的資料基礎上進行改造，效能非常高。在此將自己的一些使用心得和大家分享：

  private void ForeachTa(DataTable dtF,string id)
    {
 Stopwatch watch = new Stopwatch();
        watch.Start();
        DataTable dt = new DataTable();//準備存放資料的臨時表
 

        //構造表的列
        dt.Columns.Add("ID");
        dt.Columns.Add("MaterialID");
        dt.Columns.Add("BillID");
        dt.Columns.Add("code");
        dt.Columns.Add("Name");
        dt.Columns.Add("Model");
        dt.Columns.Add("MeasureUnit");
        dt.Columns.Add("Price");
        dt.Columns
 
.Add("Provider");
        dt.Columns.Add("LastPrice");
        foreach (DataRow row in dtF.Rows)
        {
            if (row["MaterialID"] == DBNull.Value)
            {
                if (!string.IsNullOrEmpty(row["Price"].ToString()))
                {
                    DataRow rows = dt.NewRow
 
();
                    rows["ID"] = System.Guid.NewGuid().ToString();
                    rows["BillID"] = id;
                    rows["Name"] = row["Name"];
                    rows["Model"] = row["Model"];
                    rows["MeasureUnit"] = row["MeasureUnit"];
                    rows["Price"] = decimal.Parse(row["Price"].ToString());
                    rows["Provider"] = row["Provider"];
                    dt.Rows.Add(rows);
                }
                else
                {
                    DataRow rows = dt.NewRow();
                    rows["ID"] = System.Guid.NewGuid().ToString();
                    rows["BillID"] = id;
                    rows["Name"] = row["Name"];
                    rows["Model"] = row["Model"];
                    rows["MeasureUnit"] = row["MeasureUnit"];
                    rows["Provider"] = row["Provider"];
                    dt.Rows.Add(rows);
                }
            }
            else
            {
                if (!string.IsNullOrEmpty(row["Price"].ToString()))
                {
                    DataRow rows = dt.NewRow();
                    rows["ID"] = System.Guid.NewGuid().ToString();
                    rows["MaterialID"] = row["MaterialID"];
                    rows["BillID"] = id;
                    rows["Code"] = row["Code"];
                    rows["Name"] = row["Name"];
                    rows["Model"] = row["Model"];
                    rows["MeasureUnit"] = row["MeasureUnit"];
                    rows["Price"] = decimal.Parse(row["Price"].ToString());
                    rows["LastPrice"] = decimal.Parse(row["Price"].ToString());
                    rows["Provider"] = row["Provider"];
                    dt.Rows.Add(rows);
                }
                else
                {
                    DataRow rows = dt.NewRow();
                    rows["ID"] = System.Guid.NewGuid().ToString();
                    rows["MaterialID"] = row["MaterialID"];
                    rows["BillID"] = id;
                    rows["Code"] = row["Code"];
                    rows["Name"] = row["Name"];
                    rows["Model"] = row["Model"];
                    rows["MeasureUnit"] = row["MeasureUnit"];
                    rows["Provider"] = row["Provider"];
                    dt.Rows.Add(rows);
                }

            }
        }
        //重點程式碼處理方式
        string connStr = ConfigurationManager.ConnectionStrings["SqlConnectionString"].ConnectionString;//連線字串
        using (SqlBulkCopy sqlBulkcopy = new SqlBulkCopy(connStr))
        {
            sqlBulkcopy.DestinationTableName = "表名";//定義需要存入資料庫中的相應的表的名稱
            sqlBulkcopy.ColumnMappings.Add("ID", "ID");
            sqlBulkcopy.ColumnMappings.Add("MaterialID", "MaterialID");
            sqlBulkcopy.ColumnMappings.Add("BillID", "BillID");
            sqlBulkcopy.ColumnMappings.Add("Code", "Code");
            sqlBulkcopy.ColumnMappings.Add("Name", "Name");
            sqlBulkcopy.ColumnMappings.Add("Model", "Model");
            sqlBulkcopy.ColumnMappings.Add("MeasureUnit", "MeasureUnit");
            sqlBulkcopy.ColumnMappings.Add("Price", "Price");
            sqlBulkcopy.ColumnMappings.Add("LastPrice", "LastPrice");
            sqlBulkcopy.ColumnMappings.Add("Provider", "Provider");
            sqlBulkcopy.WriteToServer(dt);
        }
        watch.Stop();
        }