C# DataTable.Equals方法代碼示例

        /// <summary>
        /// 將DataTable的數據綁定到DropDownList,
        /// 當DataTable.Rows.Count != 1時,第一條記錄SelectValue = 0
        /// </summary>
        /// <param name="ddl">DropDownList 名稱</param>
        /// <param name="dt">DataTable 名稱</param>
        public static bool InitDDL(DropDownList ddl, DataTable dt, string DataTextField, string DataValueField, bool ShowSelectText)
        {
            if (dt.Equals(null) || dt.Rows.Count < 1)
            {
                ddl.Items.Clear();
                ListItem li = new ListItem("NO DATA", "0");
                ddl.Items.Insert(0, li);
                ddl.Enabled = false;
            }
            else if (dt.Rows.Count == 1)
            {
                ddl.DataSource = dt;
                ddl.DataTextField = DataTextField;
                ddl.DataValueField = DataValueField;
                ddl.DataBind();
                ddl.Enabled = true;
            }
            else if (dt.Rows.Count > 1)
            {
                ddl.DataSource = dt;
                ddl.DataTextField = DataTextField;
                ddl.DataValueField = DataValueField;
                ddl.DataBind();

                if (ShowSelectText)
                {
                    ListItem li = new ListItem("Please Select ...", "0");
                    ddl.Items.Insert(0, li);
                }
                ddl.Enabled = true;
            }
            //if (ddl.SelectedIndexChanged != null && !ddl.Items[0].Equals(new ListItem("Please Select ...", "0")))
            //{
            //        ListItem li = new ListItem("Please Select ...", "0");
            //        ddl.Items.Insert(0, li);
            //}
            return ddl.Enabled;
        }

        ///<summary>
        ///<para>Tạo thông tin vết từ Header</para>
        ///</summary>   
        /// <param name="Header"><para>Bảng lưu vết trong Header</para></param>     
        public void GetTraceInfoFromHeader(DataTable Header)
        {

            try
            {
                if (Header.Equals(null))
                {
                    return;
                }

                //Read from Header Into Trace
                Infor.ID = Utility.Int32Dbnull(Header.Rows[0]["ID"], 0);
                Infor.BranchID = Utility.CorrectStringValue(Utility.sDbnull(Header.Rows[0]["BranchID"]));
                Infor.UserName = Utility.CorrectStringValue(Utility.sDbnull(Header.Rows[0]["UserName"]));
                Infor.CreatedDate = Utility.CorrectStringValue(Utility.sDbnull(Header.Rows[0]["CreatedDate"]));
                Infor.IPAddress = Utility.CorrectStringValue(Utility.sDbnull(Header.Rows[0]["IPAddress"]));
                Infor.ComputerName = Utility.CorrectStringValue(Utility.sDbnull(Header.Rows[0]["ComputerName"]));
                Infor.AccountName = Utility.CorrectStringValue(Utility.sDbnull(Header.Rows[0]["AccountName"]));
                Infor.DLLName = Utility.CorrectStringValue(Utility.sDbnull(Header.Rows[0]["DLLName"]));
                Infor.SubSystemName = Utility.CorrectStringValue(Utility.sDbnull(Header.Rows[0]["SubSystemName"]));
                Infor.FunctionID = Utility.Int16Dbnull(Header.Rows[0]["FunctionID"]);
                Infor.FunctionName = Utility.CorrectStringValue(Utility.sDbnull(Header.Rows[0]["FunctionName"]));
                Infor.TableName = Utility.CorrectStringValue(Utility.sDbnull(Header.Rows[0]["TableName"]));
                Infor.Desc = Utility.CorrectStringValue(Utility.sDbnull(Header.Rows[0]["Desc"]));
                Infor.LOT = Utility.Int16Dbnull(Header.Rows[0]["LOT"], 0);
            }
            catch (Exception ex)
            {
                Utility.ShowMsg("Lỗi khi lấy thông tin đối tượng lưu vết từ Header\n" + ex.Message);
                return;
            }
        }

 ///<summary>
 ///<para>Lấy về đối tượng vết từ gói tin gửi từ Client lên Application Server: Header</para>
 ///</summary>   
 /// <param name="Header"><para>Bảng chứa thông tin vết. Thường là Header.Tables["Header"] <see cref="DataTable"/></para></param>     
 ///<returns>HISTrace nếu tồn tại Header. Ngược lại trả về null.</returns>
 public static TraceInfor GetTraceObjectFromHeader(DataTable Header)
 {
     TraceInfor trace = new TraceInfor();
     try
     {
         if (Header.Equals(null))
         {
             //Utility.ShowMsg("Header bạn đưa vào chưa được khởi tạo nên chưa có thông tin về Trace. Đề nghị bạn xem lại...");
             return null;
         }
         //Read from Header Into Trace
         trace.pID = Int32Dbnull(Header.Rows[0]["ID"], 0);
         trace.pBranchID = CorrectStringValue(sDbnull(Header.Rows[0]["BranchID"]));
         trace.pUserName = CorrectStringValue(sDbnull(Header.Rows[0]["UserName"]));
         trace.pCreatedDate = CorrectStringValue(sDbnull(Header.Rows[0]["CreatedDate"]));
         trace.pIPAddress = CorrectStringValue(sDbnull(Header.Rows[0]["IPAddress"]));
         trace.ComputerName = CorrectStringValue(sDbnull(Header.Rows[0]["ComputerName"]));
         trace.AccountName = CorrectStringValue(sDbnull(Header.Rows[0]["AccountName"]));
         trace.DLLName = CorrectStringValue(sDbnull(Header.Rows[0]["DLLName"]));
         trace.pSubSystemName = CorrectStringValue(sDbnull(Header.Rows[0]["SubSystemName"]));
         trace.pFunctionID = Int16Dbnull(Header.Rows[0]["FunctionID"]);
         trace.FunctionName = CorrectStringValue(sDbnull(Header.Rows[0]["FunctionName"]));
         trace.pTableName = CorrectStringValue(sDbnull(Header.Rows[0]["TableName"]));
         trace.pDesc = CorrectStringValue(sDbnull(Header.Rows[0]["Desc"]));
         trace.pLO = Int16Dbnull(Header.Rows[0]["LOT"], 0);
         return trace;
     }
     catch (Exception ex)
     {
         Utility.ShowMsg("Lỗi khi lấy đối tượng vết từ Header:\n" + ex.Message);
         return null;
     }
 }

 ///<summary>
 ///<para>Gắn Header vào Entity để truyền lên BusinessLogic xử lý</para>
 ///</summary>   
 /// <param name="Entity"><para>Entity chứa thông tin nghiệp vụ</para></param>     
 /// <param name="Header"><para>Header chứa gói tin lưu vết và loại nghiệp vụ cần thao tác</para></param>     
 ///<returns></returns>
 public static void MergeHeader(ref DataSet Entity, DataTable Header)
 {
     try
     {
         if (Entity.Equals(null))
         {
             Utility.ShowMsg("Bạn phải khởi tạo Entity trước khi thực hiện hàm này");
             return;
         }
         if (Header.Equals(null))
         {
             Utility.ShowMsg("Bạn phải khởi tạo Header trước khi thực hiện hàm này");
             return;
         }
         if (Entity.Tables.Contains(Header.TableName))
         {
             Entity.Tables.Remove(Header.TableName);
             Entity.AcceptChanges();
             Entity.Merge(Header);
             Entity.AcceptChanges();
         }
         else
         {
             Entity.Merge(Header);
             Entity.AcceptChanges();
         }
     }
     catch (Exception ex)
     {
         ShowMsg("Lỗi khi gắn Header vào Entity:\n" + ex.Message);
     }
 }

        ///<summary>
        ///<para>Đưa giá trị của vết vào Header trước khi gửi lên Business xử lý</para>
        ///</summary>   
        /// <param name="Header"><para>Bảng lưu vết</para></param>     
        /// <param name="trace"><para>Đối tượng vết <see cref="HISTrace"/></para></param>     
        public void MergeTraceIntoHeader(ref DataTable Header, TraceInfor trace)
        {
            try
            {
                DataRow dr;
                bool bExist = false;
                if (Header.Equals(null))
                {
                    Utility.ShowMsg("Không thể gắn Trace vào Header vì đối tượng Header bạn truyền vào chưa được khởi tạo. Đề nghị bạn xem lại...");
                    return;
                }
                if (Header.Rows.Count > 0)
                {
                    dr = Header.Rows[0];
                    bExist = true;
                }
                else
                {
                    bExist = false;
                    dr = Header.NewRow();
                }
                //Read from Header Into Trace
                if (trace == null) return;
                dr["ID"] = Utility.Int16Dbnull(trace.pID, 0);

                dr["BranchID"] = Utility.CorrectStringValue(Utility.sDbnull(trace.pBranchID));
                dr["UserName"] = Utility.CorrectStringValue(Utility.sDbnull(trace.pUserName));
                dr["CreatedDate"] = Utility.CorrectStringValue(Utility.sDbnull(trace.pCreatedDate, DateTime.Now.ToShortDateString()));
                dr["IPAddress"] = Utility.CorrectStringValue(Utility.sDbnull(trace.pIPAddress));
                dr["ComputerName"] = Utility.CorrectStringValue(Utility.sDbnull(trace.ComputerName));
                dr["AccountName"] = Utility.CorrectStringValue(Utility.sDbnull(trace.AccountName));
                dr["DLLName"] = Utility.CorrectStringValue(Utility.sDbnull(trace.DLLName));
                dr["SubSystemName"] = Utility.CorrectStringValue(Utility.sDbnull(trace.pSubSystemName));
                dr["FunctionID"] = Utility.CorrectStringValue(Utility.sDbnull(trace.pFunctionID));
                dr["FunctionName"] = Utility.CorrectStringValue(Utility.sDbnull(trace.FunctionName));
                dr["TableName"] = Utility.CorrectStringValue(Utility.sDbnull(trace.pTableName));
                dr["Desc"] = Utility.CorrectStringValue(Utility.sDbnull(trace.pDesc));
                dr["LOT"] = Utility.Int16Dbnull(trace.pLO, 0);
                if (!bExist)
                {
                    Header.Rows.Add(dr);
                }
                Header.AcceptChanges();
            }
            catch (Exception ex)
            {
                Utility.ShowMsg("Lỗi khi tạo gán thông tin Trace vào Header:\n" + ex.Message);
                return;
            }
        }

 /// <summary>
 /// 導出含標題樣式的Excel
 /// </summary>
 /// <param name="dt">數據表</param>
 /// <param name="FileName">文件名</param>
 public static void CreateExcel(DataTable dataTable, string FileName,StringBuilder title,string bodyTr,string bodyTd,StringBuilder end)
 {
     if (dataTable != null && !dataTable.Equals(null))
     {
         //////////body 數據部分
         for (int i = 0; i < dataTable.Rows.Count; i++)
         {
             title.Append(bodyTr);
             for (int j = 0; j < dataTable.Columns.Count; j++)
             {
                 title.Append(bodyTd + dataTable.Rows[i][j].ToString() + "</td>");
             }
             title.Append("</tr>");
         }
         //////////////
         title.Append(end.ToString());
         HttpResponse resp = System.Web.HttpContext.Current.Response;
         resp.ClearContent();
         resp.ContentEncoding = System.Text.Encoding.Default;
         resp.AppendHeader("Content-Disposition", "attachment;filename=" + FileName);
         resp.ContentType = "application/excel";
         resp.Write(title);
         resp.End(); 
     }
 }

 void AcceptancePlan_TableRowChanged(DataTable dataTable, DataColumn currentColumn, DataRow currentRow)
 {
     if (dataTable.Equals(NomenclatureInfo))
         {
         if (currentColumn.Equals(NomenclatureCount) || currentColumn.Equals(NomenclaturePrice))
             {
             fillNomenclatureRowData(currentRow);
             }
         }
     else if (dataTable.Equals(TareInfo))
         {
         if (currentColumn.Equals(TareCount) || currentColumn.Equals(TarePrice))
             {
             fillTareRowData(currentRow);
             }
         }
 }

        /// <summary>
        /// 數據批量導入 DataTable方式寫入數據,resData源數據
        /// </summary>
        /// <param name="resData"></param>
        /// <param name="server_Connect"></param>
        /// <param name="desTable"></param>
        public void dataTableCopy(DataTable resData, String desTable, ref string error)
        {
            error = "0";
            if (resData == null || resData.Equals(null))
            {
                error = "源數據為空";
                return;
            }
            SqlConnection conn = new SqlConnection(ConnectionString);
            conn.Open();
            SqlTransaction sqlbulkTransaction = conn.BeginTransaction();
            ////允許自增
            SqlBulkCopy sqlbulkcopy = new SqlBulkCopy(conn, SqlBulkCopyOptions.KeepIdentity, sqlbulkTransaction);
            try
            {
                //請在插入數據的同時檢查約束，如果發生錯誤調用sqlbulkTransaction事務
                sqlbulkcopy.DestinationTableName = desTable;//數據庫中的表名

                for (int i = 0; i < resData.Columns.Count; i++)
                {
                    //列映射
                    sqlbulkcopy.ColumnMappings.Add(resData.Columns[i].ColumnName, resData.Columns[i].ColumnName);
                }
                sqlbulkcopy.WriteToServer(resData);//源數據
                sqlbulkTransaction.Commit();
                sqlbulkcopy.Close();
            }
            catch (Exception ex)
            {
                sqlbulkTransaction.Rollback();
                error = ex.ToString();
            }
            finally
            {
                //sqlbulkcopy.Close();
            }
        }

 void AcceptanceOfGoods_TableRowChanged(DataTable dataTable, DataColumn currentColumn, DataRow currentRow)
 {
     if (dataTable.Equals(NomenclatureInfo))
         {
         if (currentColumn.Equals(Nomenclature))
             {
             fillTareInRow(currentRow);
             }
         else if (currentColumn.Equals(NomenclatureParty))
             {
             fillDateInRow(currentRow);
             }
         }
 }

 void AcceptanceOfGoods_TableRowAdded(DataTable dataTable, DataRow currentRow)
 {
     if (dataTable.Equals(NomenclatureInfo))
         {
         currentRow[NomenclatureCode] = newCodeNumber;
         }
 }