[英]Parsing CSV strings (not files) in C#
Using C#, I need to parse a CSV string that doesn't come from a file.使用 C#,我需要解析不是来自文件的 CSV 字符串。 I've found a great deal of material on parsing CSV files, but virtually nothing on strings.我发现了大量关于解析 CSV 文件的资料,但几乎没有关于字符串的资料。 It seems as though this should be simple, yet thus far I can come up only with inefficient methods, such as this:似乎这应该很简单,但到目前为止,我只能提出低效的方法,例如:
using Microsoft.VisualBasic.FileIO;
var csvParser = new TextFieldParser(new StringReader(strCsvLine));
csvParser.SetDelimiters(new string[] { "," });
csvParser.HasFieldsEnclosedInQuotes = true;
Are there good ways of making this more efficient and less ugly?有没有让这更高效、更丑陋的好方法? I will be processing huge volumes of strings, so I wouldn't want to pay the cost of all the above.我将处理大量的字符串,所以我不想支付上述所有费用。 Thanks.谢谢。
Here is a lightly tested parser that handles quotes这是一个经过轻微测试的解析器,可以处理引号
List<string> Parse(string line)
{
var columns = new List<string>();
var sb = new StringBuilder();
bool isQuoted = false;
int nQuotes = 0;
foreach(var c in line)
{
if (sb.Length == 0 && !isQuoted && c == '"')
{
isQuoted = true;
continue;
}
if (isQuoted)
{
if (c == '"')
{
nQuotes++;
continue;
}
else
{
if (nQuotes > 0)
{
sb.Append('"', nQuotes / 2);
if (nQuotes % 2 != 0)
{
isQuoted = false;
}
nQuotes = 0;
}
}
}
if (!isQuoted && c == ',')
{
columns.Add(sb.ToString());
sb.Clear();
continue;
}
sb.Append(c);
}
if (nQuotes > 0)
{
sb.Append('"', nQuotes / 2);
}
columns.Add(sb.ToString());
return columns;
}
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