我有以下代码从csv文件读取值并进行一些处理。我想跳过输入的csv文件的第一行,因为它包含标题文本,但我想在处理完成后将其添加回去。
List<string> values = new List<string>();
using (StreamReader sr = new StreamReader(filePath))
{
while (sr.Peek() != -1)
{
string line = sr.ReadLine();
List<string> lineValues = line.Split(',').ToList();
var tempMinInt = 1;
var tempValue = 1;
var tempValInt = Convert.ToInt32(lineValues[4]);
if (lineValues[3] == "1876")
{
if (tempValInt % 60 != 0)
{
tempMinInt = (tempValInt / 60) + 1;
tempValue = tempMinInt * 30;
}
else
{
tempMinInt = tempValInt / 60;
tempValue = tempMinInt * 30;
}
}
else if (lineValues[3] == "1875")
{
if (tempValInt != 0)
{
tempValue = 500;
}
else
tempValue = 0;
}
if (lineValues[3] == "1876")
{
values.Add(string.Join(",", lineValues) + "," + "0" + "," + "30" + "," + tempValue.ToString());
}
else if (lineValues[3] == "1875")
{
values.Add(string.Join(",", lineValues) + "," + "1" + "," + "500" + "," + tempValue.ToString());
}
}
}
示例输入csv看起来像这样:
id, datetime, msisdn, num, duration
33083,2011-12-19 05:17:57+06:30,98590149,1875,258
33084,2011-12-19 05:22:28+06:30,98590149,1875,69
33085,2011-12-19 05:23:45+06:30,98590149,1875,151
33086,2011-12-19 05:30:21+06:30,98590149,1875,58
33087,2011-12-19 06:44:19+06:30,949826259,1875,66
而且我想要这样的输出:
id, datetime, msisdn, num, duration, type, ammount, total
33083,2011-12-19 05:17:57+06:30,98590149,1875,258,1,500,500
33084,2011-12-19 05:22:28+06:30,98590149,1875,69,1,500,500
33085,2011-12-19 05:23:45+06:30,98590149,1875,151,1,500,500
33086,2011-12-19 05:30:21+06:30,98590149,1875,58,1,500,500
在进入循环之前,请先阅读它。我会这样做:
using (StreamReader sr = new StreamReader(filePath))
{
string headerLine = sr.ReadLine();
string line;
while ((line = sr.ReadLine()) != null)
{
...
}
}
((我个人不喜欢使用Peek。)
然后写出输出时,以headerLine
开头。
只需阅读第一行,然后不对其进行任何操作...
List<string> values = new List<string>();
using (StreamReader sr = new StreamReader(filePath))
{
sr.ReadLine();
while (sr.Peek() != -1)
{
string line = sr.ReadLine();
List<string> lineValues = line.Split(',').ToList();
//***//
}
}
类似这样的东西:
bool isFirst=true;
using (StreamReader sr = new StreamReader(filePath))
{
while (sr.Peek() != -1)
{
if(isFirst)
{
isFirst=false;
continue;
}
}
}
您可以在while循环之前读取第一行并将其存储,或者可以使用counter / boolean字段来检查文件在哪里。
我建议使用技术来处理这种情况,
int row = 0;
using (StreamReader sr = new StreamReader(filePath))
{
While(reader.Read()) //Each row of the file
{
row++;
if(row==1)
{
continue;
}
}
... code..
}