如何打開CSV文件更新某些行，列，刪除一些行並將其另存爲VB.net中的另一個CSV文件？

Question

我有一個csv文件。我需要打開它，根據列值刪除整行，更新少數列值並將文件另存爲.dat文件。 我使用2010 VB.net

Answer 1

您可以使用LINQ來加載，刪除和更新您的CSV，例如：

Const separator = ","c 
Dim csvPath = "C:\Temp\USPresident.csv" 
Dim datPath = "C:\Temp\USPresident.dat" 
Dim rows = (From line In IO.File.ReadAllLines(csvPath) 
       Select line.Split(separator)).ToList 
' get all lines with specific value ' 
Dim presidentRows = (From cols In rows 
       Where cols.Contains("William Howard Taft")).ToList 
' remove these lines with Except' 
Dim rowsWithoutPresident = rows.Except(presidentRows).ToList 
' update some values ' 
For Each row In rowsWithoutPresident 
    row(3) = "test-value" 
Next 
Dim newLines = (From cols In rowsWithoutPresident 
       Select String.Join(separator, cols)).ToArray 
IO.File.WriteAllLines(datPath, newLines) 

測試與this csv-file with US-presidents。

Option Strict On | Option Infer在|上Option Explicit對