excel data table 在哪?

一、DataTable简介(1)构造函数DataTable() 不带参数初始化DataTable 类的新实例。DataTable(string tableName) 用指定的表名初始化DataTable 类的新实例。DataTable(string tableName, string tableNamespace) 用指定的表名和命名空间初始化DataTable类的新实例。(2) 常用属性CaseSensitive 指示表中的字符串比较是否区分大小写。ChildRelations 获取此DataTable 的子关系的集合。Columns 获取属于该表的列的集合。Constraints 获取由该表维护的约束的集合。DataSet 获取此表所属的DataSet。DefaultView 获取可能包括筛选视图或游标位置的表的自定义视图。HasErrors 获取一个值，该值指示该表所属的DataSet 的任何表的任何行中是否有错误。MinimumCapacity 获取或设置该表最初的起始大小。该表中行的最初起始大小。默认值为 50。Rows 获取属于该表的行的集合。TableName 获取或设置DataTable 的名称。(3)常用方法AcceptChanges() 提交自上次调用AcceptChanges() 以来对该表进行的所有更改。BeginInit() 开始初始化在窗体上使用或由另一个组件使用的DataTable。初始化发生在运行时。Clear() 清除所有数据的DataTable。Clone() 克隆DataTable 的结构，包括所有DataTable 架构和约束。EndInit() 结束在窗体上使用或由另一个组件使用的DataTable 的初始化。初始化发生在运行时。ImportRow(DataRow row) 将DataRow 复制到DataTable 中，保留任何属性设置以及初始值和当前值。Merge(DataTable table) 将指定的DataTable 与当前的DataTable 合并。NewRow() 创建与该表具有相同架构的新DataRow。二、DataTable使用技巧（1）Create a DataTableDataTable dt = new DataTable("Table_AX");（2）Add columns for DataTable//Method 1dt.Columns.Add("column0", System.Type.GetType("System.String"));//Method 2DataColumn dc = new DataColumn("column1", System.Type.GetType("System.Boolean"));dt.Columns.Add(dc);（3）Add rows for DataTable//Initialize the rowDataRow dr = dt.NewRow();dr["column0"] = "AX";dr["column1"] = true;dt.Rows.Add(dr);//Doesn't initialize the rowDataRow dr1 = dt.NewRow();dt.Rows.Add(dr1);（4）Select row//Search the second row 如果没有赋值,则用is null来selectDataRow[] drs = dt.Select("column1 is null");DataRow[] drss = dt.Select("column0 = 'AX'");（5）Copy DataTable include dataDataTable dtNew = dt.Copy();（6）Copy DataTable only schemeDataTable dtOnlyScheme = dt.Clone();（7）Operate one row//对dt的操作//Method 1DataRow drOperate = dt.Rows[0];drOperate["column0"] = "AXzhz";drOperate["column1"] = false;//Method 2drOperate[0] = "AXzhz";drOperate[1] = false;//Method 3dt.Rows[0]["column0"] = "AXzhz";dt.Rows[0]["column1"] = false;//Method 4dt.Rows[0][0] = "AXzhz";dt.Rows[0][1] = false;（8）Evaluate another DataTable's row to current DatatabledtOnlyScheme.Rows.Add(dt.Rows[0].ItemArray);（9）Convert to stringSystem.IO.StringWriter sw = new System.IO.StringWriter();System.Xml.XmlTextWriter xw = new System.Xml.XmlTextWriter(sw);dt.WriteXml(xw);string s = sw.ToString();（10）Filter DataTabledt.DefaultView.RowFilter = "column1 <> true";dt.DefaultView.RowFilter = "column1 = true";（11）Sort rowdt.DefaultView.Sort = "ID ,Name ASC";dt=dt.DefaultView.ToTable();（12）Bind DataTable//绑定的其实是DefaultViewgvTestDataTable.DataSource = dt;gvTestDataTable.DataBind();（13）judge the DataTable’s Column name is a string//判断一个字符串是否为DataTable的列名dtInfo.Columns.Contains("AX");（14）DataTable convert to XML and XML convert to DataTableprotected void Page_Load(object sender, EventArgs e){DataTable dt_AX = new DataTable();//dt_AX.Columns.Add("Sex", typeof(System.Boolean));//DataRow dr = dt_AX.NewRow();//dr["Sex"] = true;//dt_AX.Rows.Add(dr);string xml=ConvertBetweenDataTableAndXML_AX(dt_AX);DataTable dt = ConvertBetweenDataTableAndXML_AX(xml);}public string ConvertBetweenDataTableAndXML_AX(DataTable dtNeedCoveret){System.IO.TextWriter tw = new System.IO.StringWriter();//if TableName is empty, WriteXml() will throw Exception.dtNeedCoveret.TableName=dtNeedCoveret.TableName.Length==0?"Table_AX":dtNeedCoveret.TableName;dtNeedCoveret.WriteXml(tw);dtNeedCoveret.WriteXmlSchema(tw);return tw.ToString();}public DataTable ConvertBetweenDataTableAndXML_AX(string xml){System.IO.TextReader trDataTable = new System.IO.StringReader(xml.Substring(0, xml.IndexOf("<?xml")));System.IO.TextReader trSchema = new System.IO.StringReader(xml.Substring(xml.IndexOf("<?xml")));DataTable dtReturn = new DataTable();dtReturn.ReadXmlSchema(trSchema);dtReturn.ReadXml(trDataTable);return dtReturn;}

excel data table 在哪?

excel data table 在哪

2回答