在CSV文件中写入C#对象列表

Question

我有一个C#对象有8个大小为200的数组元素.我需要将这些数组打印到相应标签上的CSV文件中.数据可能包含string,int和double.

例如:

time   time1   time2  Day  time4  time4 time5 time6 time7
1       5       9     Mon   7.0    8      9    5     NA
2
3
3
.
.
200    200    200    Sun   200    200   200   200    200

哎呀,time1等是标签(Header)数据(8个列表有200个元素)应该在这些标签下写入.感谢您的回复!

Answer 1

您可以编写一个通用函数来编写对象:

public void WriteCSV<T>(IEnumerable<T> items, string path)
{
  Type itemType = typeof(T);
  var props = itemType.GetProperties(BindingFlags.Public | BindingFlags.Instance)
                      .OrderBy(p => p.Name);

  using (var writer = new StreamWriter(path))
  {
    writer.WriteLine(string.Join(", ", props.Select(p => p.Name)));

    foreach (var item in items)
    {
      writer.WriteLine(string.Join(", ", props.Select(p => p.GetValue(item, null))));
    }
  }
}

用作:

var people = new List<Person> { new Person("Matt", "Abbott"), new Person("John Smith") };
WriteCSV(people, @"C:\people.csv");

其中可能的输出:

Forename, Surname
Matt", Abbott"
John", Smith"

Answer 2

假设您的数据都不需要逗号转义，这应该给您一个大致的想法：

string[][] myArray = // your data
string[] myHeaders = // your headers
File.WriteAllText("somefile.csv", 
        string.Join(Environment.NewLine, 
            new[]{myHeaders}.Concat(myArray)
            .Select(line => string.Join(",", line))));