asp.net DataTable相关操作集锦(筛选,取前N条数据,去重复行,获取指定列数据等)

2025-05-29 0 63

本文实例总结了asp.net DataTable相关操作。分享给大家供大家参考,具体如下:

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#region DataTable筛选,排序返回符合条件行组成的新DataTable或直接用DefaultView按条件返回

/// <summary>

/// DataTable筛选,排序返回符合条件行组成的新DataTable或直接用DefaultView按条件返回

/// eg:SortExprDataTable(dt,"Sex='男'","Time Desc",1)

/// </summary>

/// <param name="dt">传入的DataTable</param>

/// <param name="strExpr">筛选条件</param>

/// <param name="strSort">排序条件</param>

/// <param name="mode">1,直接用DefaultView按条件返回,效率较高;2,DataTable筛选,排序返回符合条件行组成的新DataTable</param>

public static DataTable SortDataTable(DataTable dt, string strExpr, string strSort, int mode)

{

switch (mode)

{

case 1:

//方法一 直接用DefaultView按条件返回

dt.DefaultView.RowFilter = strExpr;

dt.DefaultView.Sort = strSort;

return dt;

case 2:

//方法二 DataTable筛选,排序返回符合条件行组成的新DataTable

DataTable dt1 = new DataTable();

DataRow[] GetRows = dt.Select(strExpr, strSort);

//复制DataTable dt结构不包含数据

dt1 = dt.Clone();

foreach (DataRow row in GetRows)

{

dt1.Rows.Add(row.ItemArray);

}

return dt1;

default:

return dt;

}

}

#endregion

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#region 获取DataTable前几条数据

/// <summary>

/// 获取DataTable前几条数据

/// </summary>

/// <param name="TopItem">前N条数据</param>

/// <param name="oDT">源DataTable</param>

/// <returns></returns>

public static DataTable DtSelectTop(int TopItem, DataTable oDT)

{

if (oDT.Rows.Count < TopItem) return oDT;

DataTable NewTable = oDT.Clone();

DataRow[] rows = oDT.Select("1=1");

for (int i = 0; i < TopItem; i++)

{

NewTable.ImportRow((DataRow)rows[i]);

}

return NewTable;

}

#endregion

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#region 获取DataTable中指定列的数据

/// <summary>

/// 获取DataTable中指定列的数据

/// </summary>

/// <param name="dt">数据源</param>

/// <param name="tableName">新的DataTable的名词</param>

/// <param name="strColumns">指定的列名集合</param>

/// <returns>返回新的DataTable</returns>

public static DataTable GetTableColumn(DataTable dt, string tableName, params string[] strColumns)

{

DataTable dtn = new DataTable();

if (dt == null)

{

throw new ArgumentNullException("参数dt不能为null");

}

try

{

dtn = dt.DefaultView.ToTable(tableName, true, strColumns);

}

catch (Exception e)

{

throw new Exception(e.Message);

}

return dtn;

}

#endregion

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using System;

using System.Collections.Generic;

using System.Linq;

using System.Data;

using System.Collections;

using System.Text;

namespace GuanEasy

{

/// <summary>

/// DataSet助手

/// </summary>

public class DataSetHelper

{

private class FieldInfo

{

public string RelationName;

public string FieldName;

public string FieldAlias;

public string Aggregate;

}

private DataSet ds;

private ArrayList m_FieldInfo;

private string m_FieldList;

private ArrayList GroupByFieldInfo;

private string GroupByFieldList;

public DataSet DataSet

{

get { return ds; }

}

#region Construction

public DataSetHelper()

{

ds = null;

}

public DataSetHelper(ref DataSet dataSet)

{

ds = dataSet;

}

#endregion

#region Private Methods

private bool ColumnEqual(object objectA, object objectB)

{

if ( objectA == DBNull.Value && objectB == DBNull.Value )

{

return true;

}

if ( objectA == DBNull.Value || objectB == DBNull.Value )

{

return false;

}

return ( objectA.Equals( objectB ) );

}

private bool RowEqual(DataRow rowA, DataRow rowB, DataColumnCollection columns)

{

bool result = true;

for ( int i = 0; i < columns.Count; i++ )

{

result &= ColumnEqual( rowA[ columns[ i ].ColumnName ], rowB[ columns[ i ].ColumnName ] );

}

return result;

}

private void ParseFieldList(string fieldList, bool allowRelation)

{

if ( m_FieldList == fieldList )

{

return;

}

m_FieldInfo = new ArrayList();

m_FieldList = fieldList;

FieldInfo Field;

string[] FieldParts;

string[] Fields = fieldList.Split( ',' );

for ( int i = 0; i <= Fields.Length - 1; i++ )

{

Field = new FieldInfo();

FieldParts = Fields[ i ].Trim().Split( ' ' );

switch ( FieldParts.Length )

{

case 1:

//to be set at the end of the loop

break;

case 2:

Field.FieldAlias = FieldParts[ 1 ];

break;

default:

return;

}

FieldParts = FieldParts[ 0 ].Split( '.' );

switch ( FieldParts.Length )

{

case 1:

Field.FieldName = FieldParts[ 0 ];

break;

case 2:

if ( allowRelation == false )

{

return;

}

Field.RelationName = FieldParts[ 0 ].Trim();

Field.FieldName = FieldParts[ 1 ].Trim();

break;

default:

return;

}

if ( Field.FieldAlias == null )

{

Field.FieldAlias = Field.FieldName;

}

m_FieldInfo.Add( Field );

}

}

private DataTable CreateTable(string tableName, DataTable sourceTable, string fieldList)

{

DataTable dt;

if ( fieldList.Trim() == "" )

{

dt = sourceTable.Clone();

dt.TableName = tableName;

}

else

{

dt = new DataTable( tableName );

ParseFieldList( fieldList, false );

DataColumn dc;

foreach ( FieldInfo Field in m_FieldInfo )

{

dc = sourceTable.Columns[ Field.FieldName ];

DataColumn column = new DataColumn();

column.ColumnName = Field.FieldAlias;

column.DataType = dc.DataType;

column.MaxLength = dc.MaxLength;

column.Expression = dc.Expression;

dt.Columns.Add( column );

}

}

if ( ds != null )

{

ds.Tables.Add( dt );

}

return dt;

}

private void InsertInto(DataTable destTable, DataTable sourceTable,

string fieldList, string rowFilter, string sort)

{

ParseFieldList( fieldList, false );

DataRow[] rows = sourceTable.Select( rowFilter, sort );

DataRow destRow;

foreach ( DataRow sourceRow in rows )

{

destRow = destTable.NewRow();

if ( fieldList == "" )

{

foreach ( DataColumn dc in destRow.Table.Columns )

{

if ( dc.Expression == "" )

{

destRow[ dc ] = sourceRow[ dc.ColumnName ];

}

}

}

else

{

foreach ( FieldInfo field in m_FieldInfo )

{

destRow[ field.FieldAlias ] = sourceRow[ field.FieldName ];

}

}

destTable.Rows.Add( destRow );

}

}

private void ParseGroupByFieldList(string FieldList)

{

if ( GroupByFieldList == FieldList )

{

return;

}

GroupByFieldInfo = new ArrayList();

FieldInfo Field;

string[] FieldParts;

string[] Fields = FieldList.Split( ',' );

for ( int i = 0; i <= Fields.Length - 1; i++ )

{

Field = new FieldInfo();

FieldParts = Fields[ i ].Trim().Split( ' ' );

switch ( FieldParts.Length )

{

case 1:

//to be set at the end of the loop

break;

case 2:

Field.FieldAlias = FieldParts[ 1 ];

break;

default:

return;

}

FieldParts = FieldParts[ 0 ].Split( '(' );

switch ( FieldParts.Length )

{

case 1:

Field.FieldName = FieldParts[ 0 ];

break;

case 2:

Field.Aggregate = FieldParts[ 0 ].Trim().ToLower();

Field.FieldName = FieldParts[ 1 ].Trim( ' ', ')' );

break;

default:

return;

}

if ( Field.FieldAlias == null )

{

if ( Field.Aggregate == null )

{

Field.FieldAlias = Field.FieldName;

}

else

{

Field.FieldAlias = Field.Aggregate + "of" + Field.FieldName;

}

}

GroupByFieldInfo.Add( Field );

}

GroupByFieldList = FieldList;

}

private DataTable CreateGroupByTable(string tableName, DataTable sourceTable, string fieldList)

{

if ( fieldList == null || fieldList.Length == 0 )

{

return sourceTable.Clone();

}

else

{

DataTable dt = new DataTable( tableName );

ParseGroupByFieldList( fieldList );

foreach ( FieldInfo Field in GroupByFieldInfo )

{

DataColumn dc = sourceTable.Columns[ Field.FieldName ];

if ( Field.Aggregate == null )

{

dt.Columns.Add( Field.FieldAlias, dc.DataType, dc.Expression );

}

else

{

dt.Columns.Add( Field.FieldAlias, dc.DataType );

}

}

if ( ds != null )

{

ds.Tables.Add( dt );

}

return dt;

}

}

private void InsertGroupByInto(DataTable destTable, DataTable sourceTable, string fieldList,

string rowFilter, string groupBy)

{

if ( fieldList == null || fieldList.Length == 0 )

{

return;

}

ParseGroupByFieldList( fieldList );

ParseFieldList( groupBy, false );

DataRow[] rows = sourceTable.Select( rowFilter, groupBy );

DataRow lastSourceRow = null, destRow = null;

bool sameRow;

int rowCount = 0;

foreach ( DataRow sourceRow in rows )

{

sameRow = false;

if ( lastSourceRow != null )

{

sameRow = true;

foreach ( FieldInfo Field in m_FieldInfo )

{

if ( !ColumnEqual( lastSourceRow[ Field.FieldName ], sourceRow[ Field.FieldName ] ) )

{

sameRow = false;

break;

}

}

if ( !sameRow )

{

destTable.Rows.Add( destRow );

}

}

if ( !sameRow )

{

destRow = destTable.NewRow();

rowCount = 0;

}

rowCount += 1;

foreach ( FieldInfo field in GroupByFieldInfo )

{

switch ( field.Aggregate.ToLower() )

{

case null:

case "":

case "last":

destRow[ field.FieldAlias ] = sourceRow[ field.FieldName ];

break;

case "first":

if ( rowCount == 1 )

{

destRow[ field.FieldAlias ] = sourceRow[ field.FieldName ];

}

break;

case "count":

destRow[ field.FieldAlias ] = rowCount;

break;

case "sum":

destRow[ field.FieldAlias ] = Add( destRow[ field.FieldAlias ], sourceRow[ field.FieldName ] );

break;

case "max":

destRow[ field.FieldAlias ] = Max( destRow[ field.FieldAlias ], sourceRow[ field.FieldName ] );

break;

case "min":

if ( rowCount == 1 )

{

destRow[ field.FieldAlias ] = sourceRow[ field.FieldName ];

}

else

{

destRow[ field.FieldAlias ] = Min( destRow[ field.FieldAlias ], sourceRow[ field.FieldName ] );

}

break;

}

}

lastSourceRow = sourceRow;

}

if ( destRow != null )

{

destTable.Rows.Add( destRow );

}

}

private object Min(object a, object b)

{

if ( ( a is DBNull ) || ( b is DBNull ) )

{

return DBNull.Value;

}

if ( ( (IComparable) a ).CompareTo( b ) == -1 )

{

return a;

}

else

{

return b;

}

}

private object Max(object a, object b)

{

if ( a is DBNull )

{

return b;

}

if ( b is DBNull )

{

return a;

}

if ( ( (IComparable) a ).CompareTo( b ) == 1 )

{

return a;

}

else

{

return b;

}

}

private object Add(object a, object b)

{

if ( a is DBNull )

{

return b;

}

if ( b is DBNull )

{

return a;

}

return ( (decimal) a + (decimal) b );

}

private DataTable CreateJoinTable(string tableName, DataTable sourceTable, string fieldList)

{

if ( fieldList == null )

{

return sourceTable.Clone();

}

else

{

DataTable dt = new DataTable( tableName );

ParseFieldList( fieldList, true );

foreach ( FieldInfo field in m_FieldInfo )

{

if ( field.RelationName == null )

{

DataColumn dc = sourceTable.Columns[ field.FieldName ];

dt.Columns.Add( dc.ColumnName, dc.DataType, dc.Expression );

}

else

{

DataColumn dc = sourceTable.ParentRelations[ field.RelationName ].ParentTable.Columns[ field.FieldName ];

dt.Columns.Add( dc.ColumnName, dc.DataType, dc.Expression );

}

}

if ( ds != null )

{

ds.Tables.Add( dt );

}

return dt;

}

}

private void InsertJoinInto(DataTable destTable, DataTable sourceTable,

string fieldList, string rowFilter, string sort)

{

if ( fieldList == null )

{

return;

}

else

{

ParseFieldList( fieldList, true );

DataRow[] Rows = sourceTable.Select( rowFilter, sort );

foreach ( DataRow SourceRow in Rows )

{

DataRow DestRow = destTable.NewRow();

foreach ( FieldInfo Field in m_FieldInfo )

{

if ( Field.RelationName == null )

{

DestRow[ Field.FieldName ] = SourceRow[ Field.FieldName ];

}

else

{

DataRow ParentRow = SourceRow.GetParentRow( Field.RelationName );

DestRow[ Field.FieldName ] = ParentRow[ Field.FieldName ];

}

}

destTable.Rows.Add( DestRow );

}

}

}

#endregion

#region SelectDistinct / Distinct

/// <summary>

/// 按照fieldName从sourceTable中选择出不重复的行,

/// 相当于select distinct fieldName from sourceTable

/// </summary>

/// <param name="tableName">表名</param>

/// <param name="sourceTable">源DataTable</param>

/// <param name="fieldName">列名</param>

/// <returns>一个新的不含重复行的DataTable,列只包括fieldName指明的列</returns>

public DataTable SelectDistinct(string tableName, DataTable sourceTable, string fieldName)

{

DataTable dt = new DataTable( tableName );

dt.Columns.Add( fieldName, sourceTable.Columns[ fieldName ].DataType );

object lastValue = null;

foreach ( DataRow dr in sourceTable.Select( "", fieldName ) )

{

if ( lastValue == null || !( ColumnEqual( lastValue, dr[ fieldName ] ) ) )

{

lastValue = dr[ fieldName ];

dt.Rows.Add( new object[]{lastValue} );

}

}

if ( ds != null && !ds.Tables.Contains( tableName ) )

{

ds.Tables.Add( dt );

}

return dt;

}

/// <summary>

/// 按照fieldName从sourceTable中选择出不重复的行,

/// 相当于select distinct fieldName1,fieldName2,,fieldNamen from sourceTable

/// </summary>

/// <param name="tableName">表名</param>

/// <param name="sourceTable">源DataTable</param>

/// <param name="fieldNames">列名数组</param>

/// <returns>一个新的不含重复行的DataTable,列只包括fieldNames中指明的列</returns>

public DataTable SelectDistinct(string tableName, DataTable sourceTable, string[] fieldNames)

{

DataTable dt = new DataTable( tableName );

object[] values = new object[fieldNames.Length];

string fields = "";

for ( int i = 0; i < fieldNames.Length; i++ )

{

dt.Columns.Add( fieldNames[ i ], sourceTable.Columns[ fieldNames[ i ] ].DataType );

fields += fieldNames[ i ] + ",";

}

fields = fields.Remove( fields.Length - 1, 1 );

DataRow lastRow = null;

foreach ( DataRow dr in sourceTable.Select( "", fields ) )

{

if ( lastRow == null || !( RowEqual( lastRow, dr, dt.Columns ) ) )

{

lastRow = dr;

for ( int i = 0; i < fieldNames.Length; i++ )

{

values[ i ] = dr[ fieldNames[ i ] ];

}

dt.Rows.Add( values );

}

}

if ( ds != null && !ds.Tables.Contains( tableName ) )

{

ds.Tables.Add( dt );

}

return dt;

}

/// <summary>

/// 按照fieldName从sourceTable中选择出不重复的行,

/// 并且包含sourceTable中所有的列。

/// </summary>

/// <param name="tableName">表名</param>

/// <param name="sourceTable">源表</param>

/// <param name="fieldName">字段</param>

/// <returns>一个新的不含重复行的DataTable</returns>

public DataTable Distinct(string tableName, DataTable sourceTable, string fieldName)

{

DataTable dt = sourceTable.Clone();

dt.TableName = tableName;

object lastValue = null;

foreach ( DataRow dr in sourceTable.Select( "", fieldName ) )

{

if ( lastValue == null || !( ColumnEqual( lastValue, dr[ fieldName ] ) ) )

{

lastValue = dr[ fieldName ];

dt.Rows.Add( dr.ItemArray );

}

}

if ( ds != null && !ds.Tables.Contains( tableName ) )

{

ds.Tables.Add( dt );

}

return dt;

}

/// <summary>

/// 按照fieldNames从sourceTable中选择出不重复的行,

/// 并且包含sourceTable中所有的列。

/// </summary>

/// <param name="tableName">表名</param>

/// <param name="sourceTable">源表</param>

/// <param name="fieldNames">字段</param>

/// <returns>一个新的不含重复行的DataTable</returns>

public DataTable Distinct(string tableName, DataTable sourceTable, string[] fieldNames)

{

DataTable dt = sourceTable.Clone();

dt.TableName = tableName;

string fields = "";

for ( int i = 0; i < fieldNames.Length; i++ )

{

fields += fieldNames[ i ] + ",";

}

fields = fields.Remove( fields.Length - 1, 1 );

DataRow lastRow = null;

foreach ( DataRow dr in sourceTable.Select( "", fields ) )

{

if ( lastRow == null || !( RowEqual( lastRow, dr, dt.Columns ) ) )

{

lastRow = dr;

dt.Rows.Add( dr.ItemArray );

}

}

if ( ds != null && !ds.Tables.Contains( tableName ) )

{

ds.Tables.Add( dt );

}

return dt;

}

#endregion

#region Select Table Into

/// <summary>

/// 按sort排序,按rowFilter过滤sourceTable,

/// 复制fieldList中指明的字段的数据到新DataTable,并返回之

/// </summary>

/// <param name="tableName">表名</param>

/// <param name="sourceTable">源表</param>

/// <param name="fieldList">字段列表</param>

/// <param name="rowFilter">过滤条件</param>

/// <param name="sort">排序</param>

/// <returns>新DataTable</returns>

public DataTable SelectInto(string tableName, DataTable sourceTable,

string fieldList, string rowFilter, string sort)

{

DataTable dt = CreateTable( tableName, sourceTable, fieldList );

InsertInto( dt, sourceTable, fieldList, rowFilter, sort );

return dt;

}

#endregion

#region Group By Table

public DataTable SelectGroupByInto(string tableName, DataTable sourceTable, string fieldList,

string rowFilter, string groupBy)

{

DataTable dt = CreateGroupByTable( tableName, sourceTable, fieldList );

InsertGroupByInto( dt, sourceTable, fieldList, rowFilter, groupBy );

return dt;

}

#endregion

#region Join Tables

public DataTable SelectJoinInto(string tableName, DataTable sourceTable, string fieldList, string rowFilter, string sort)

{

DataTable dt = CreateJoinTable( tableName, sourceTable, fieldList );

InsertJoinInto( dt, sourceTable, fieldList, rowFilter, sort );

return dt;

}

#endregion

#region Create Table

public DataTable CreateTable(string tableName, string fieldList)

{

DataTable dt = new DataTable( tableName );

DataColumn dc;

string[] Fields = fieldList.Split( ',' );

string[] FieldsParts;

string Expression;

foreach ( string Field in Fields )

{

FieldsParts = Field.Trim().Split( " ".ToCharArray(), 3 ); // allow for spaces in the expression

// add fieldname and datatype

if ( FieldsParts.Length == 2 )

{

dc = dt.Columns.Add( FieldsParts[ 0 ].Trim(), Type.GetType( "System." + FieldsParts[ 1 ].Trim(), true, true ) );

dc.AllowDBNull = true;

}

else if ( FieldsParts.Length == 3 ) // add fieldname, datatype, and expression

{

Expression = FieldsParts[ 2 ].Trim();

if ( Expression.ToUpper() == "REQUIRED" )

{

dc = dt.Columns.Add( FieldsParts[ 0 ].Trim(), Type.GetType( "System." + FieldsParts[ 1 ].Trim(), true, true ) );

dc.AllowDBNull = false;

}

else

{

dc = dt.Columns.Add( FieldsParts[ 0 ].Trim(), Type.GetType( "System." + FieldsParts[ 1 ].Trim(), true, true ), Expression );

}

}

else

{

return null;

}

}

if ( ds != null )

{

ds.Tables.Add( dt );

}

return dt;

}

public DataTable CreateTable(string tableName, string fieldList, string keyFieldList)

{

DataTable dt = CreateTable( tableName, fieldList );

string[] KeyFields = keyFieldList.Split( ',' );

if ( KeyFields.Length > 0 )

{

DataColumn[] KeyFieldColumns = new DataColumn[KeyFields.Length];

int i;

for ( i = 1; i == KeyFields.Length - 1; ++i )

{

KeyFieldColumns[ i ] = dt.Columns[ KeyFields[ i ].Trim() ];

}

dt.PrimaryKey = KeyFieldColumns;

}

return dt;

}

#endregion

}

}

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