尝试：

 List< DataSet> liststring =  new  List< DataSet>（）; 
 ... 
 liststring.Add（fieldFromDB2）; 

如果你要添加一个字符串，那么你需要一个字符串列表

列表< string> liststring =  new  List< string>（）; 
 liststring.Add（YourFieldAsString）; 

您好，

您的

列表< DataSet> liststring = new List< DataSet>（）; 

是命名空间中的List（

 System.Collections.Generic; 

）

此列表中的每个项目都是数据集类型。

所以在命令中给它分配一个字符串值

你需要做什么类似这样的事情

 liststring [0] .Tables [0] .Rows [0] [0] = fieldFromDB2; 

在上面的语句中，我将此字符串

 fieldFromDB2 

分配给第一个数据集的第一个数据集集合中第一行的第一列，即

 liststring 

或者您需要在数据表中添加此

 fieldFromDB2 

然后在数据集中添加此表，然后使用

 liststring.Add（dataset）

br />
或者您需要更改

 List< DataSet> liststring = new List< string>（）; 

然后

 liststring.Add（fieldFromDB2）; 

希望这会对你有所帮助。

标记是否有用。



-

谢谢

Hi,

I am filtering the common msgIDs of 3 excel sheet columns with the following code
How can I place them into a list string

int  i = 2;
                    foreach (DataRow row in lstDS[2].Tables[0].Rows)
                    {


                        string fieldFromDB = row[1].ToString();
                        string FromDB = row[2].ToString();

                        foreach (DataRow row1 in lstDS[0].Tables[0].Rows)
                        {
                            string fieldFromDB1 = row1[1].ToString();

                            if (fieldFromDB == fieldFromDB1)
                            {

                                foreach (DataRow row2 in lstDS[1].Tables[0].Rows)
                                {
                                    string fieldFromDB2 = row2[1].ToString();

                                    if (fieldFromDB1 == fieldFromDB2)
                                    {

                                       //do something

                                    }



                                }
                            }
                        }
                    }

when I am trying to do something like this

List<DataSet> liststring = new List<DataSet>();<br />
liststring=fieldFromDB2;

It is giving some error like cannot convert string to list string


Thanks
John

Try:

List<DataSet> liststring = new List<DataSet>();
...
liststring.Add(fieldFromDB2);

If you are adding a string then you need a string list

List<string> liststring = new List<string>();
liststring.Add(YourFieldAsString);

Hi,
Your

List<DataSet> liststring = new List<DataSet>();

is a List from namespace (

System.Collections.Generic;

)
Each item in this list is of type Dataset.
So in an order to assign a string value to it
you need to do something like this

liststring[0].Tables[0].Rows[0][0] = fieldFromDB2;

Here in above statement I am assigning this string

fieldFromDB2

to first dataset's first table's first row's first column in your collection of datasets i.e.

liststring

Or either you need to add this

fieldFromDB2

in a datatable and then add this table in a dataset and then add this dataset in list
using

liststring.Add(dataset)

Or either you need to change

List<DataSet> liststring = new List<string>(); 

and then

liststring.Add(fieldFromDB2);

Hope this will help you.
Mark if useful.

--
Thanks