CODEWITHSUNDEEP
c#asp.net
Ye Myat Aung
Ye Myat Aung

Reputation: 1853

How to concat string to List C#

I was trying to add the strings to the List and export the list as csv file but the result I got is not the way I want. Here is the code -

List<string> values = new List<string>();
using (StreamReader sr = new StreamReader(filePath))
{
    while (sr.Peek() != -1)
    {
        string line = sr.ReadLine();
        List<string> lineValues = line.Split(',').ToList();
        var tempMinInt = 1;
        var tempValue = 1;
        var tempValInt = Convert.ToInt32(lineValues[4]);
        if (tempValInt % 60 != 0)
        {
            tempMinInt = (tempValInt / 60) + 1;
            tempValue = tempMinInt * 30;
        }
        else
        {
            tempMinInt = tempValInt / 60;
            tempValue = tempMinInt * 30;
        }


        values.Add(lineValues + "," + tempValue.ToString());

    }
}

Here is the sample input data: 

33083,2011-12-19 05:17:57+06:30,98590149,1876,258
33084,2011-12-19 05:22:28+06:30,98590149,1876,69
33085,2011-12-19 05:23:45+06:30,98590149,1876,151
33086,2011-12-19 05:30:21+06:30,98590149,1876,58
33087,2011-12-19 06:44:19+06:30,949826259,1876,66

And here is the output data:

System.Collections.Generic.List`1[System.String],150
System.Collections.Generic.List`1[System.String],60
System.Collections.Generic.List`1[System.String],90
System.Collections.Generic.List`1[System.String],30
System.Collections.Generic.List`1[System.String],60

Please advice. Thank you.

Upvotes: 1

Views: 1444

Answers (3)

Kyle Trauberman
Kyle Trauberman

Reputation: 25684

List<T> does not override ToString, so you'll need to do the leg work here.

You can use string.Join to combine the values of the list into a comma separated string:

string.Join(",", lineValues.ToArray());

Your last line of code posted above will become:

values.Add(string.Join(",", lineValues.ToArray()) + "," + tempValue.ToString());

http://msdn.microsoft.com/en-us/library/57a79xd0.aspx

Alternatively, you can just use line in this code snippet, as lineValues is built from line and you aren't modifying any of the values.

Upvotes: 5

cwharris
cwharris

Reputation: 18125

What you're looking for is string.Join(",", lineValues)

Try this:

values.Add(string.Join(",", lineValues) + "," + tempValue.ToString());

Also, this won't work if any of those line values contain characters that need to be escaped.

See here for a solution to escaping characters.

Upvotes: 0

eouw0o83hf
eouw0o83hf

Reputation: 9588

.NET is trying to turn a List of strings into a string, and it doesn't know how to do this implicitly. I think you should check out string.Join, and use it like:

values.Add(string.Join(",", lineValues) + "," + tempValue.ToString());

This will turn the list of strings into a comma-separated string.

Upvotes: 2

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