如何从CSV文件中删除所需的字符串 [英] how to delete required string from csv file

问题描述

大家都试图实现在某些csv文件中删除行；
文件的示例：

hi all try to realize deleting line in some csv file; example of file:

24 august 2013 г.,,14:00,00:00,;
24 august 2013 г.,,14:00,00:00,;
24 august 2013 г.,2342,14:00,00:00,23424;
24 august 2013 г.,2342,14:00,19:00,23424;

criteria - 24 august 2013 г.,2342

结果必须像

 24 august 2013 г.,,14:00,00:00,;
 24 august 2013 г.,,14:00,00:00,;

我的想法
打开文件-

my idea open file -

FileStream fs = new FileStream(filePath, FileMode.Open, 
            FileAccess.ReadWrite);
        StreamReader sr = new StreamReader(fs);

将所有数据放入数组中

        string lines = sr.ReadToEnd();
        string []result = lines.Split(';');

比获取删除数据的条件（某些字符串）

than get criteria for deleting data (some string)

        string criteria = dateTimePicker1.Text.ToString()+','
            +eventNameDeleteTextBox.Text.ToString();
sr.Close();

在数组中搜索，

             int startStr = lines.IndexOf(criteria);//find start position
        int length = lines.IndexOf(';',startStr)-startStr;//find end position

删除
字符串dataRemoved = lines.Substring（startStr，length）;
viewTextBox.Text = dataRemoved;

delete string dataRemoved = lines.Substring(startStr,length); viewTextBox.Text = dataRemoved;

并写入文件更新的数据

    FileStream fs1 = new FileStream(filePath, FileMode.Open,
                FileAccess.Write, FileShare.None);
        StreamWriter sw = new StreamWriter(fs1);

        sw.WriteLine(dataRemoved);
        sw.Close();

但是它不能正常工作-它的复制字符串必须删除到文件的开头并删除所有;符号，哪里错了？

but it's work not correctly - it;s copy string that must be deleted to the start of the file and remove all ; symbols, where im wrong?

推荐答案

尝试类似的方法，如果您的文件很小，那么下面的解决方案应该不是问题。

Try something like this, If your file is small then below solution shouldn't be a problem.

string rawdata = @"24 august 2013 г.,,14:00,00:00,;
24 august 2013 г.,,14:00,00:00,;
24 august 2013 г.,2342,14:00,00:00,23424;
24 august 2013 г.,2342,14:00,19:00,23424;";//consider this is raw file

string[] lines = rawdata.Split(new string[] { Environment.NewLine }, StringSplitOptions.RemoveEmptyEntries);

List<string> result = new List<string>();
foreach (var line in lines)
{
    if (!line.Contains("24 august 2013 г.,2342"))
    {
        result.Add(line);
    }
}

现在您的预期结果将在结果列表。您可以使用结果列表创建一个新文件。

now your expected result will be in result List. You can create a new file with result List.

如果这不能回答您的问题，请提供更多信息。我会尝试提供更好的解决方案。

If this is not answering your question give more info. I'll try to give better solution.

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