C# DataTable常用方法总结
2016-06-23 14:16
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在项目中经常用到DataTable,如果DataTable使用得当,不仅能使程序简洁实用,而且能够提高性能,达到事半功倍的效果,现对DataTable的使用技巧进行一下总结。
一、DataTable简介
(1)构造函数
(2) 常用属性
(3)常用方法
二、DataTable使用技巧
(1)Createa DataTable
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DataTable dt = new DataTable("Table_AX");
(2)Addcolumns for DataTable
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//Method 1
dt.Columns.Add("column0", System.Type.GetType("System.String"));
//Method 2
DataColumn dc = new DataColumn("column1", System.Type.GetType("System.Boolean"));
dt.Columns.Add(dc); <strong>
rong>
(3)Add rows for DataTable
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//Initialize the row
DataRow dr = dt.NewRow();
dr["column0"] = "AX";
dr["column1"] = true;
dt.Rows.Add(dr);
//Doesn't initialize the row
DataRow dr1 = dt.NewRow();
dt.Rows.Add(dr1);
(4)Select row
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//Search the second row 如果没有赋值,则用is null来select
DataRow[] drs = dt.Select("column1 is null");
DataRow[] drss = dt.Select("column0 = 'AX'");
(5)Copy DataTable include data
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DataTable dtNew = dt.Copy();
(6)Copy DataTable only scheme
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DataTable dtOnlyScheme = dt.Clone();
(7)Operate one row
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//对dt的操作
//Method 1
DataRow drOperate = dt.Rows[0];
drOperate["column0"] = "AXzhz";
drOperate["column1"] = false;
//Method 2
drOperate[0] = "AXzhz";
drOperate[1] = false;
//Method 3
dt.Rows[0]["column0"] = "AXzhz";
dt.Rows[0]["column1"] = false;
//Method 4
dt.Rows[0][0] = "AXzhz";
dt.Rows[0][1] = false;
(8)Evaluate another DataTable's row to currentDatatable
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dtOnlyScheme.Rows.Add(dt.Rows[0].ItemArray);
(9)Convert to string
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System.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 DataTable
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dt.DefaultView.RowFilter = "column1 <> true";
dt.DefaultView.RowFilter = "column1 = true";
(11)Sort row
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dt.DefaultView.Sort = "ID ,Name ASC";
dt=dt.DefaultView.ToTable();
(12)Bind DataTable
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//绑定的其实是DefaultView
gvTestDataTable.DataSource = dt;
gvTestDataTable.DataBind();
(13)judge the DataTable’s Column name is a string
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//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 toDataTable
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protected 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;
}
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 |
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 |
AcceptChanges() | 提交自上次调用AcceptChanges()以来对该表进行的所有更改 |
RejectChanges() | 方法被调用时,仍处于编辑模式的任何行将取消其编辑。新行被移除。已修改的和已删除的行返回到其原始状态(DataRowState.Unchanged) |
GetChanges() | 获取DataTable 的副本,该副本包含自上次加载以来或自调用AcceptChanges 以来对该数据集进行的所有更改。 |
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 |
Copy() | 复制,具有与该 DataTable相同的结构(表架构和约束)和数据。 注意如果这些类已经过派生,则副本也具有相同的派生类 |
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 合并操作仅对原始表和要合并的表进行操作。子表不会受到影响或被包括在内。如果某个表具有一个或多个作为关系的一部分定义的子表,则需要分别合并每个子表 |
NewRow() | 创建与该表具有相同架构的新DataRow |
二、DataTable使用技巧
(1)Createa DataTable
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DataTable dt = new DataTable("Table_AX");
(2)Addcolumns for DataTable
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//Method 1
dt.Columns.Add("column0", System.Type.GetType("System.String"));
//Method 2
DataColumn dc = new DataColumn("column1", System.Type.GetType("System.Boolean"));
dt.Columns.Add(dc); <strong>
rong>
(3)Add rows for DataTable
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//Initialize the row
DataRow dr = dt.NewRow();
dr["column0"] = "AX";
dr["column1"] = true;
dt.Rows.Add(dr);
//Doesn't initialize the row
DataRow dr1 = dt.NewRow();
dt.Rows.Add(dr1);
(4)Select row
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//Search the second row 如果没有赋值,则用is null来select
DataRow[] drs = dt.Select("column1 is null");
DataRow[] drss = dt.Select("column0 = 'AX'");
(5)Copy DataTable include data
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DataTable dtNew = dt.Copy();
(6)Copy DataTable only scheme
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DataTable dtOnlyScheme = dt.Clone();
(7)Operate one row
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//对dt的操作
//Method 1
DataRow drOperate = dt.Rows[0];
drOperate["column0"] = "AXzhz";
drOperate["column1"] = false;
//Method 2
drOperate[0] = "AXzhz";
drOperate[1] = false;
//Method 3
dt.Rows[0]["column0"] = "AXzhz";
dt.Rows[0]["column1"] = false;
//Method 4
dt.Rows[0][0] = "AXzhz";
dt.Rows[0][1] = false;
(8)Evaluate another DataTable's row to currentDatatable
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dtOnlyScheme.Rows.Add(dt.Rows[0].ItemArray);
(9)Convert to string
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System.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 DataTable
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dt.DefaultView.RowFilter = "column1 <> true";
dt.DefaultView.RowFilter = "column1 = true";
(11)Sort row
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dt.DefaultView.Sort = "ID ,Name ASC";
dt=dt.DefaultView.ToTable();
(12)Bind DataTable
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//绑定的其实是DefaultView
gvTestDataTable.DataSource = dt;
gvTestDataTable.DataBind();
(13)judge the DataTable’s Column name is a string
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//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 toDataTable
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protected 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;
}
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