C# 比较C中的两个DataGridView并删除相同的行
我有两个DataGridView。在我的第一个DataGridView中执行一些操作之后，我将行？？传输到我的第二个DataGridView。现在，我想这样做。在第二个DataGridView中，我不想添加与第一个DataGridView相同的行 我的DataGridView1如下所示：C# 比较C中的两个DataGridView并删除相同的行,c#,sql-server,datagridview,datatable,multiple-columns,C#,Sql Server,Datagridview,Datatable,Multiple Columns,我有两个DataGridView。在我的第一个DataGridView中执行一些操作之后，我将行？？传输到我的第二个DataGridView。现在，我想这样做。在第二个DataGridView中，我不想添加与第一个DataGridView相同的行 我的DataGridView1如下所示： Column 1 Column 2 --------------------------------------- hel
Column 1 Column 2
---------------------------------------
hello friends 250
hi guys 15
good day 15684
old days 156153
bye bye 6143
Column 1 Column 2
---------------------------------------
new coders 88
hello friends 250
january february 31
such good 1684
play music 1553
bye bye 6143
Column 1 Column 2
---------------------------------------
new coders 88
january february 31
such good 1684
play music 1553
Column 1 Column 2
---------------------------------------
new coders 88
hello friends 250
january february 31
such good 1684
play music 1553
bye bye 6143
Column 1 Column 2
---------------------------------------
new coders 88
january february 31
such good 1684
play music 1553
connection.Open();
string[] ss = listBox.SelectedItem.ToString().Split(' ');
int css = ss.Count();
for (int mi = 0; mi < css; mi++)
{
string mq = "SELECT c1, c2, c3 FROM myTable WHERE c1='" + ss[mi] + "' OR c2='" + ss[mi] + "'";
SqlDataAdapter da = new SqlDataAdapter(mq, connection);
DataTable dt1 = new DataTable();
sd.Fill(dt1);
foreach (DataRow r in dt1.Rows)
{
dgv1.Rows.Add(r["c1"].ToString() + " " + r["c2"].ToString(), r["c3"]);
}
}
//Some insignificant operations.
for (int mi2 = 0; mi2 < countOFMYNEWFORDGV1; mi2++)
{
string mySecondQuery= "SELECT c1, c2, c3 FROM myTable WHERE c1='" + myNEWFORDGV1[mi2] + "' OR c2='" + myNEWFORDGV1[mi2] + "'";
SqlDataAdapter secondDA= new SqlDataAdapter(mySecondQuery, conection);
DataTable dtForSecond= new DataTable();
secondDA.Fill(dtForSecond);
foreach (DataRow mySecondRow in dtForSecond.Rows)
{
dgv2.Rows.Add(mySecondRow["c1"].ToString() + " " + mySecondRow["c2"].ToString(), mySecondRow["c3"]);
}
}
con.Close();
注2：请分享您的完整答案。非常感谢。我建议不要在每一行中循环，而是在单个查询中获得结果。通过使用left-outer连接，我们将获得DataGridView2的所有结果以及DataGridView1的公共记录，然后我们将通过空值过滤器过滤掉所需的记录
GO
;with cte as (
Select dg2.[Column 1] as c1, dg2.[Column 2] as c2, dg1.[Column 1] as dc1
from DataGridView2 as dg2 left outer join DataGridView1 as dg1
on dg2.[Column 1]=dg1.[Column 1] and dg2.[Column 2]=dg1.[Column 2] )
select * from cte where dc1 is null
GO
如果有任何混淆，请ping我以获得相同的结果。我建议在单个查询中获得结果，而不是循环遍历每一行。通过使用left-outer连接，我们将获得DataGridView2的所有结果以及DataGridView1的公共记录，然后我们将通过空值过滤器过滤掉所需的记录
GO
;with cte as (
Select dg2.[Column 1] as c1, dg2.[Column 2] as c2, dg1.[Column 1] as dc1
from DataGridView2 as dg2 left outer join DataGridView1 as dg1
on dg2.[Column 1]=dg1.[Column 1] and dg2.[Column 2]=dg1.[Column 2] )
select * from cte where dc1 is null
GO
如果有任何困惑，请与我联系。您可以通过以下两种方法之一解决此问题 检索两个数据表中的数据并删除C代码中的重复行。 不要从数据库本身检索重复的行。 下面是我使用上面列出的方法2编写的示例代码，用于解决与您相同的问题 表和变量中的实际数据是基于您共享的代码假设的 首先，数据库中有一个表“myTable”，其中包含以下数据
c1 | c2 | c3
----------------------------
hello | friends | 250
hi | guys | 15
good | day | 15684
old | days | 156153
bye | bye | 6143
new | coders | 88
january| february | 31
such | good | 1684
play | music | 1553
var sqlConnection = new SqlConnection("Data Source=<<dbserver>>; Initial Catalog=<<dbname>>;uid=<<uid>>;password=<<password>>");
var adapter = new SqlDataAdapter();
var str = "'" + string.Join("','", ss) + "'";
// Instead of looping thru all the items of ss to query the database again and again
// I am using IN query to query the database in one opration.
string sqlstmt = "SELECT * FROM myTable where c1 IN (" + str + ") or c2 IN (" + str +")";
DataSet dataSet = new DataSet();
sqlConnection.Open();
adapter = new SqlDataAdapter(sqlstmt, sqlConnection);
adapter.Fill(dataSet);
sqlConnection.Close();
dataGridView1.DataSource = dataSet.Tables[0];
//With above code GridView1 displayed data a following.
c1 | c2 | c3
----------------------------
hello | friends | 250
hi | guys | 15
good | day | 15684
old | days | 156153
bye | bye | 6143
// With following line of code I am trying to remove duplicate query parameters.
// I am doing this because Same SELECT statement is being used
// to query the data for both GridView1 and GridView2.
// Only the parameter value changes.
myNEWFORDGV1 = myNEWFORDGV1.Except(ss).ToArray();
str = "'" + string.Join("','", myNEWFORDGV1) + "'";
string query = "SELECT * FROM myTable where c1 IN (" + str + ") or c2 IN (" + str + ")";
dataSet = new DataSet();
adapter = new SqlDataAdapter(query, sqlConnection);
adapter.Fill(dataSet);
sqlConnection.Close();
dataGridView2.DataSource = dataSet.Tables[0];
GridView2 will display following data now.
c1 | c2 | c3
----------------------------
new | coders | 88
january| february | 31
such | good | 1684
play | music | 1553
尝试并理解此代码的逻辑，并将其应用到您的用例中。这将解决重复行的问题。您可以通过以下两种方法之一解决此问题 检索两个数据表中的数据并删除C代码中的重复行。 不要从数据库本身检索重复的行。 下面是我使用上面列出的方法2编写的示例代码，用于解决与您相同的问题 表和变量中的实际数据是基于您共享的代码假设的 首先，数据库中有一个表“myTable”，其中包含以下数据
c1 | c2 | c3
----------------------------
hello | friends | 250
hi | guys | 15
good | day | 15684
old | days | 156153
bye | bye | 6143
new | coders | 88
january| february | 31
such | good | 1684
play | music | 1553
var sqlConnection = new SqlConnection("Data Source=<<dbserver>>; Initial Catalog=<<dbname>>;uid=<<uid>>;password=<<password>>");
var adapter = new SqlDataAdapter();
var str = "'" + string.Join("','", ss) + "'";
// Instead of looping thru all the items of ss to query the database again and again
// I am using IN query to query the database in one opration.
string sqlstmt = "SELECT * FROM myTable where c1 IN (" + str + ") or c2 IN (" + str +")";
DataSet dataSet = new DataSet();
sqlConnection.Open();
adapter = new SqlDataAdapter(sqlstmt, sqlConnection);
adapter.Fill(dataSet);
sqlConnection.Close();
dataGridView1.DataSource = dataSet.Tables[0];
//With above code GridView1 displayed data a following.
c1 | c2 | c3
----------------------------
hello | friends | 250
hi | guys | 15
good | day | 15684
old | days | 156153
bye | bye | 6143
// With following line of code I am trying to remove duplicate query parameters.
// I am doing this because Same SELECT statement is being used
// to query the data for both GridView1 and GridView2.
// Only the parameter value changes.
myNEWFORDGV1 = myNEWFORDGV1.Except(ss).ToArray();
str = "'" + string.Join("','", myNEWFORDGV1) + "'";
string query = "SELECT * FROM myTable where c1 IN (" + str + ") or c2 IN (" + str + ")";
dataSet = new DataSet();
adapter = new SqlDataAdapter(query, sqlConnection);
adapter.Fill(dataSet);
sqlConnection.Close();
dataGridView2.DataSource = dataSet.Tables[0];
GridView2 will display following data now.
c1 | c2 | c3
----------------------------
new | coders | 88
january| february | 31
such | good | 1684
play | music | 1553
尝试并理解此代码的逻辑，并将其应用到您的用例中。这将解决重复行的问题。从代码中可以清楚地看出，ss是一个字符串数组。您还可以共享myNEWFORDGV1的数据类型吗？在第二个for循环之前，您应该执行myNEWFORDGV1=myNEWFORDGV1.Exceptss.ToArray@ChetanRanpariya ss是字符串数组，myNEWFORDGV1是字符串。我为什么要这样做？@ChetanRanpariya我的代码没有问题。我只想做我提到的。@ChetanRanpariya我想我需要一个DataTable操作，但我不知道怎么做。从你的代码中可以清楚地看出ss是一个字符串数组。您还可以共享myNEWFORDGV1的数据类型吗？在第二个for循环之前，您应该执行myNEWFORDGV1=myNEWFORDGV1.Exceptss.ToArray@ChetanRanpariya ss是字符串数组，myNEWFORDGV1是字符串。我为什么要这样做？@ChetanRanpariya我的代码没有问题。我只想做我提到的。@ChetanRanpariya我想我需要一个DataTable操作，但我不知道怎么做。我应该在哪里添加这个代码？我不明白。我应该在哪里添加此代码？我不明白。我对这份工作太陌生了。有时我不理解复杂的结构，因为我是新手。我会试试的，谢谢你的回答，谢谢你浪费时间。我以为我需要这样的东西，但没有用；DataTable dt1=新的DataTable；DataTable dt2=新的DataTable；列表表2 Column1=dt2.AsEnumerable.Selectx=>x.FieldColumn1.ToList；DataTable dt3=dt1.AsEnumerable.Wherex=>table2Column1.IndexOfx.FieldColumn1>=0.CopyToDataTable；我对这项工作太陌生了。有时我不理解复杂的结构，因为我是新手。我会试试的，谢谢你的回答，谢谢你浪费时间。我以为我需要这样的东西，但没有用；DataTable dt1=新的DataTable；DataTable dt2=新的DataTable；列表表2 Column1=dt2.AsEnumerable.Selectx=>x.FieldColumn1.ToList；DataTable dt3=dt1.AsEnumerable.Wherex=>table2Column1.IndexOfx.FieldColumn1>=0.CopyToDataTable；