我的问题是从文本文件中获取连续数据。这是对问题的描述：
我的要求是将每一行保存在文本文件中。此文本文件由外部源以未知间隔提供。此外，最重要的是 - 当文件达到100行（例如）时，它会将这些行存档在无法访问的源中并清除其内容。
考虑一下监听器查看文件并看到它包含10行的情况，监听器将采用这些行并保存它们。然后在增量时间（例如1秒）之后，它再次窥视并看到93行。它还保存了83个未被记录的内容。 现在，当听众第三次偷看时，它会看到3行。它显然可以保存它们，但请注意，听众没有记录7行（索引94-100）。
看起来在恒定三角洲偷看不会确保不会发生错过。
您如何建议达到此要求的最佳方式？
答案 0 :(得分：0)
这是从文件中逐行获取数据并将其保存到数据库＆gt;＆gt;
的代码 string line;
string[] subLine;
DialogResult result = openFileDialog1.ShowDialog();
try
{
if (result == DialogResult.OK)
{
string file = openFileDialog1.FileName;
StreamReader inputData = new StreamReader(file);
const int maxRecords = 500;
int actualRecords = 0;
while ((line = inputData.ReadLine()) != null)
{
subLine = line.Split(',');
try
{
string unknown = "unknown Fileld";
con.Open();
// int j=subLine.Length;
//for(int i=0;i<subLine.Length;i++)
if (actualRecords < maxRecords)
{
int i = 0;
//int j=subLine.Length;
//int index=subLine.Length-j;
// SQL= "insert into tradeFile values('" + ID + "','" + subLine[i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + unknown + "')";
cmd = new SqlCommand("insert into tradeFile values('" + subLine[i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + unknown + "')", con);
// cmd = new OleDbCommand("insert into tradeFile values('" + subLine[i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + unknown + "')", con);
cmd.ExecuteNonQuery();
actualRecords++;
// j--;
}
else
{
int i = 0;
//int j=subLine.Length;
//int index=subLine.Length-j;
cmd = new SqlCommand("insert into tradeFile values('" + subLine[i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + unknown + "')", con);
//cmd = new OleDbCommand("insert into tradeFile values('" + subLine[i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + subLine[++i].ToString() + "','" + unknown + "')", con);
cmd.ExecuteNonQuery();
actualRecords = 0;
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
finally
{
con.Close();
}
//counter++;
}
inputData.Close();
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
希望您能应用更多逻辑，这将对您有所帮助。
答案 1 :(得分：0)
有关更多不同的文件操作详情，请单击此处
答案 2 :(得分：0)
您可以使用某种形式的集合来保存这些行，例如List<string>并使用while或if语句{{1来验证List1.Add(line)对集合的容量（例如100） }}
如果您对该文件具有读/写权限，则可以在将其添加到集合后删除这些行。