AddRange 取代 Add

 

 

 

 

 

 

 

 

Add和AddRange

Add：将指定的对象添加到……中

AddRange：向……末尾，添加数组

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在群体操作时，使用AddRange取代Add

用AddRange可以让我们要加入的东西一次性加入，而不要每次都加一次，这样显然可以加快速度。几乎所有的windows control都支持Add和AddRange两种方法。

 

Add:

 

For i = 0 To param.Length - 1
        comm.Parameters.Add(param(i))
Next i

 

AddRange:

 

Comm.Parameters.AddRange(Param)

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支持Add和AddRange的类：
StringCollection, TraceCollection, SqlParameter, etc.
HttpWebRequest
UserControl
ColumnHeader

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原代码：

''' ExecuteQuery,查询数据操作 ''' </summary> ''' <param name="strSql">sql语句</param> ''' <param name="param">参数集合</param> ''' <param name="ct">命令类型</param> ''' <returns>DataTable类型，数据表</returns> ''' <remarks></remarks> Public Function ExecuteQuery(ByVal strSql As String, ByVal param() As SqlParameter, ByVal ct As CommandType) As DataTable Dim dt As New DataTable comm = New SqlCommand(strSql, Me.GetConn) comm.CommandType = ct If param IsNot Nothing Then For i = 0 To param.Length - 1 comm.Parameters.Add(param(i)) Next i End If Try dr = comm.ExecuteReader() dt.Load(dr) Catch ex As Exception Throw ex Finally dr.Close() conn.Close() End Try Return dt End Function

 

修改后：

''' <summary> ''' 查询方法 ''' </summary> ''' <param name="myCommandType">sql语句类型:区别于存储过程</param> ''' <param name="Param">参数数组</param> ''' <param name="strSql">sql语句</param> Public Function ExecuteQuery(ByVal myCommandType As CommandType, ByVal Param() As SqlParameter, ByVal strSql As String) As DataTable Dim dt As New DataTable Comm = New SqlCommand(strSql, Me.GetConn) Comm.CommandType = myCommandType If Param IsNot Nothing Then Comm.Parameters.AddRange(Param) End If Try myDataReader = Comm.ExecuteReader dt.Load(myDataReader) Catch ex As Exception Throw ex Finally myDataReader.Close() Conn.Close() End Try Return dt End Function