C＃，所以我认为我需要拆分一个字符串

Question

so I have this application that I have inherited from someone that is long gone. The gist of the application is that it reads in a .cvs file that has about 5800 lines in it, copies it over to another .cvs, which it creates new each time, after striping out a few things , #, ', &. Well everything works great, or it has until about a month ago. so I started checking into it, and what I have found so far is that there are about 131 items missing from the spreadsheet. Now I read someplace that the maximun amount of data a string can hold is over 1,000,000,000 chars, and my spreadsheet is way under that, around 800,000 chars, but the only thing I can think is doing it is the string object.

So anyway, here is the code in question, this piece appears

to both read in from the existing field, and output to the new file:

StreamReader s = new StreamReader(File);

//Read the rest of the data in the file.
string AllData = s.ReadToEnd();

//Split off each row at the Carriage Return/Line Feed
//Default line ending in most windows exports.
//You may have to edit this to match your particular file.
//This will work for Excel, Access, etc. default exports.
string[] rows = AllData.Split("\r\n".ToCharArray(), System.StringSplitOptions.RemoveEmptyEntries);

//Now add each row to the DataSet
foreach (string r in rows)
{
    //Split the row at the delimiter.

    string[] items = r.Split(delimiter.ToCharArray());

    //Add the item
    result.Rows.Add(items);
}

If anyone can help me I would really appreciate it. I either need to figure out how to split the data better, or I need to figure out why it is cutting out the last 131 lines from the existing excel file to the new excel file.

Answer 1

One easier way to do this, since you're using "\\r\\n" for lines, would be to just use the built-in line reading method: File.ReadLines(path)

foreach(var line in File.ReadLines(path))
{
   var items = line.Split(',');
   result.Rows.Add(items);
}

Answer 2

You may want to check out the TextFieldParser class, which is part of the Microsoft.VisualBasic.FileIO namespace (yes, you can use this with C# code)

Something along the lines of:

using(var reader = new TextFieldParser("c:\\path\\to\\file"))
{
    //configure for a delimited file
    reader.TextFieldType = FieldType.Delimited;

    //configure the delimiter character (comma)
    reader.Delimiters = new[] { "," };

    while(!reader.EndOfData)
    {
        string[] row = reader.ReadFields();
        //do stuff
    }
}

This class can help with some of the issues of splitting a line into its fields, when the field may contain the delimiter.