(已解决)IO异常进程无法访问该文件，因为另一个进程正在使用该文件

Question

我正试图用程序从txt文件中删除一行，但程序打开了文本文件，所以我无法删除。我该怎么办？

private void btnDeleteTransaction_Click(object sender, EventArgs e)
{
string line = null;
string delete = txtDeleteTransId.Text;
using (reader = new StreamReader(txtFilePath.Text))
{
try { 
using (writer = new StreamWriter(txtFilePath.Text, true))
{
while ((line = reader.ReadLine()) != null)
{
if (String.Compare(line + "|", delete) == 0)
continue;
writer.WriteLine(line);
}
}
}
catch (Exception ex)
{
txtMessages.Text = "exception deleting transaction: " + ex.Message;
}
}
}

下面想好了。

Answer 1

我很笨，试图从阅读器上写东西，但你做不到。如果有人和我一样新，这是我的工作代码。

private void btnDeleteTransaction_Click(object sender, EventArgs e)
{
List<string> records = new List<string>();
found = false;
using (reader = new StreamReader(txtFilePath.Text))
{
while (!reader.EndOfStream)
{
record = reader.ReadLine();
if (record.StartsWith(txtDeleteTransId.Text + "|"))
{
found = true;
}
else
{
records.Add(record);
}
}
if (!found)
{
txtMessages.Text = "Record ID was not found";
return;
}
}
try
{
using (writer = new StreamWriter(txtFilePath.Text, false))
{
foreach (var item in records)
{
writer.WriteLine(item);
}
}
txtMessages.Text = "Record deleted";
}
catch (Exception ex)
{
txtMessages.Text = "exception deleting record: " + ex.Message;
}
}
```