c# - filehelpers - 解析可变行长度

Question

我必须解析(C#)一个 .CSV 文件，其中包含变量“宽度”和 2 行标题信息(第一行是名称，第二行是单位)。

数据如下:

示例1.CSV:

"timestamp","NAME_1","NAME_2","NAME_3","NAME_4"
"ms","unit_1","unit_2","unit_3","unit_4"
0.01,1.23,4.56,7.89,0.12
0.02,1.23,4.66,7.89,0.11
0.03,1.23,4.76,7.89,0.11
0.04,56.23,4.86,7.89,0.12

示例2.CSV:

"timestamp","NAME_1","NAME_2","NAME_3","NAME_4","NAME_5",...,"NAME_N"
"ms","unit_1","unit_2","unit_3","unit_4","unit_5",...,"unit_N"
0.01,1.23,4.56,7.89,0.12,0.13,...,0.27
0.02,1.23,4.66,7.89,0.12,0.13,...,0.22
0.03,1.23,4.76,7.89,0.11,0.13,...,0.24
0.04,56.23,4.86,7.89,0.12,0.13,...,0.29

N 是表格的“宽度”(值最大可达 128 或更大)。我打算使用Filehelpers .

我想过使用[FieldOptional()] - 但这变得非常不方便，特别是当“宽度”可变时......

我当前的尝试看起来像

[IgnoreFirst(2)]
[DelimitedRecord(",")]
public sealed class LogData
{

    public Double ts;

    public Double Field1;

    [FieldNullValue(0.0)]
    [FieldOptional()]
    public Double Field2;

    [FieldNullValue(0.0)]
    [FieldOptional()]
    public Double Field3;

    // and so on
}

任何有关“如何解决可变宽度”的帮助 - 以更优雅的方式解决问题 - 提前非常感谢!

本

Answer 1

如果您打算将文件转换为 DataTable，有一个更好的选择

请使用FileHelpers库的CsvEngine。请参阅下面的代码片段:

using (MemoryStream stream = new MemoryStream(_fileContent)) //file content can be file as byte array
            {
                TextReader reader = new StreamReader(stream);
string path = "C:\\Sample.csv";
                CsvEngine csvEngine = new CsvEngine("Model", ',', path);
                var dataTable = csvEngine.ReadStreamAsDT(reader);
//Do whatever with dataTable

}

这里的示例文件可以是 csv 文件，也可以是包含要处理的 csv 文件 header 的文本文件。 DataTable 的列将根据示例文件的标题命名

干杯