我怎么能写所有的值（属性）将在C＃中的CSV格式化字符串？ 例如：

How can I write all values (properties) into an csv formated string in C#? e.g.:

class Person(string firstName, string lastName, int_age);
Person person = new Person("Kevin","Kline",33);

现在我想一个字符串凯文;克莱恩; 33

在换句话说，我想序列化对象为CSV

In other words I want to serialize an object into CSV

推荐答案

通过使用反射，你可以从一个对象获取属性的相关信息。

By using reflection you can retrieve the property infos from an object

foreach (PropertyInfo prp in obj.GetType().GetProperties()) {
   if (prp.CanRead) {
      object value = prp.GetValue(obj, null);
      string s = value == null ? "" : value.ToString();
      string name = prp.Name;
      ...
   }
} 

在的GetProperties，方法有一个重载接受的BindingFlags 这让你确定你需要哪一种性质，如私人/公共成员/静态的。

The GetProperties method has an overload accepting BindingFlags which let you determine which kind of property you need, like private/public member/static.

您可以将它们像这样

var properties = type.GetProperties(BindingFlags.Public | 
                                    BindingFlags.NonPublic | 
                                    BindingFlags.Instance);

适用于你的问题，你可以写

Applied to your problem you could write

List<Person> people = ...;
Type type = typeof(Person);
PropertyInfo[] properties = type.GetProperties();
var sb = new StringBuilder();

// First line contains field names
foreach (PropertyInfo prp in properties) {
   if (prp.CanRead) {
      sb.Append(prp.Name).Append(';');
   }
}
sb.Length--; // Remove last ";"
sb.AppendLine();

foreach (Person person in people) {
    foreach (PropertyInfo prp in properties) {
       if (prp.CanRead) {
          sb.Append(prp.GetValue(person, null)).Append(';');
       }
    }
    sb.Length--; // Remove last ";"
    sb.AppendLine();
}

File.AppendAllText("C:\Data\Persons.csv", sb.ToString());