比较数据集或更好的主意

问题描述

如何比较另一个数据集的值。

第一个数据集 [正确记录]来自SQL Server列名称

  [id]，[subsNumber] 
  

第二个数据集 [正确和不正常的记录]来自进度数据库，除了1以外的不同列，这是 subsNumber

我如何去做另外一个数据集，其中包含所有的 [subsNumber] 来自[正确的记录]与第二个数据集的匹配记录[正确的不良记录]？

或

删除第二个数据集中的所有记录[正确和不合适的记录]，它们与第一个数据集

中的subsNumber列不匹配或任何其他想法

基本上如何从第二个数据集获取与第一个数据集相同的subsNumber的所有记录

解决方案

关键是使用System.D ata.DataRelation在一个公共列（或列）上加入2个数据表。

这里是一些从

数据表（DataTable）和数据表（DataTable（差异））;（$）
尝试{
using（DataSet dataSet = new DataSet（））{
dataSet.Tables.AddRange（new DataTable [] {ProperRecords.Copy（），ImproperRecords.Copy（）}）

DataColumn properColumn = new DataColumn（）;
properColumn = dataSet.Tables [0] .Columns [1]; //假设subsNumber在索引1

DataColumn unnlumnColumn = new DataColumn（）;
incorrectColumn = dataSet.Tables [1] .Columns [0]; //假设subsNumber在索引0

//创建DataRelation
DataRelation relation = new DataRelation（string.Empty，properColumn，incorrectColumn，false）;

dataSet.Relations.Add（relation）;

//为（int i = 0; i< ImproperRecords.Columns.Count; i ++）{
relatedTable.Columns.Add（不正确的记录）创建返回relatedTable的列
。列[i] .ColumnName，ImproperRecords.Columns [i] .DataType）;
}

relatedTable.BeginLoadData（）;

foreach（DataRow parentrow in dataSet.Tables [1] .Rows）{
DataRow [] childrows = parentrow.GetChildRows（relation）;

if（childrows！= null&& childrows.Length> 0）
relatedTable.LoadDataRow（parentrow.ItemArray，true）;

}

relatedTable.EndLoadData（）;

}
}
catch（Exception ex）{
Console.WriteLine（ex.Message）;
}

返回relatedTable;
}

How do I compare values of one data set from another.

1st dataset ["proper records"] is coming from SQL Server with column names

 [id], [subsNumber]

2nd dataset ["proper and inproper records"] is coming from progress database, with different columns except 1 which is subsNumber

How do I go and make another dataset which has all the [subsNumber] from ["proper records"] with matching records from 2nd datset ["proper inproper records"] ?

or

delete all the records in 2nd dataset["proper and inproper records"] which don't match the "subsNumber" column in the 1st dataset

or any other idea

basically How do I get all records from 2nd dataset which has same "subsNumber" as the 1st dataset

解决方案

The key is using System.Data.DataRelation to join your 2 datatables on a common column (or columns).

Here's some code derived from a post at KC's See Sharp Blog

public DataTable GetImproperRecords(DataTable ProperRecords, DataTable ImproperRecords) {
  DataTable relatedTable = new DataTable("Difference");
  try {
     using (DataSet dataSet = new DataSet()) {
        dataSet.Tables.AddRange(new DataTable[] { ProperRecords.Copy(), ImproperRecords.Copy() });

        DataColumn properColumn = new DataColumn();
        properColumn = dataSet.Tables[0].Columns[1]; // Assuming subsNumber is at index 1

        DataColumn improperColumn = new DataColumn();
        improperColumn = dataSet.Tables[1].Columns[0]; // Assuming subsNumber is at index 0

        //Create DataRelation
        DataRelation relation = new DataRelation(string.Empty, properColumn, improperColumn, false);

        dataSet.Relations.Add(relation);

        //Create columns for return relatedTable
        for (int i = 0; i < ImproperRecords.Columns.Count; i++) {
           relatedTable.Columns.Add(ImproperRecords.Columns[i].ColumnName, ImproperRecords.Columns[i].DataType);
        }

        relatedTable.BeginLoadData();

        foreach (DataRow parentrow in dataSet.Tables[1].Rows) {
           DataRow[] childrows = parentrow.GetChildRows(relation);

           if (childrows != null && childrows.Length > 0)
              relatedTable.LoadDataRow(parentrow.ItemArray, true);

        }

        relatedTable.EndLoadData();

     }
  }
  catch (Exception ex) {
     Console.WriteLine(ex.Message);
  }

  return relatedTable;
}

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