序列化对象的自定义字符串格式用于输出文件的最佳实践 [英] Best practices for serializing objects to a custom string format for use in an output file

问题描述

我正要实施以产生一个Excel友好的格式写入到输出文件，这将在后面捡起并处理特定的业务类的ToString（）的覆盖。下面是该数据应该是这样的：

I was just about to implement an override of ToString() on a particular business class in order to produce an Excel-friendly format to write to an output file, which will be picked up later and processed. Here's what the data is supposed to look like:

5555555 "LASTN SR, FIRSTN"	5555555555	13956 STREET RD 	TOWNSVILLE	MI	48890	25.88	01-003-06-0934

这没什么大不了的，我只是做一个格式字符串和重写的ToString（），但将改变的ToString（）的行为为我决定序列化这种方式，使得实施的ToString（）的任何对象所有衣衫褴褛整个库。

It's no big deal for me to just make a format string and override ToString(), but that will change the behavior of ToString() for any objects I decide to serialize this way, making the implementation of ToString() all ragged across the library.

现在，我已经读了有关的IFormatProvider ，而一个类实现这听起来像一个好主意，但我还是有点困惑，所有这种逻辑应该驻留以及如何建立格式化类。

Now, I've been reading up on IFormatProvider, and a class implementing it sounds like a good idea, but I'm still a little confused about where all this logic should reside and how to build the formatter class.

做什么，当你需要做一个CSV，制表符分隔或其他一些非XML任意字符串出对象的，你们怎么办？

What do you guys do when you need to make a CSV, tab-delimited or some other non-XML arbitrary string out of an object?

推荐答案

下面是从对象列表创建CSV，使用反射一种通用的方式：

Here is a generic fashion for creating CSV from a list of objects, using reflection:

    public static string ToCsv<T>(string separator, IEnumerable<T> objectlist)
    {
        Type t = typeof(T);
        FieldInfo[] fields = t.GetFields();

        string header = String.Join(separator, fields.Select(f => f.Name).ToArray());

        StringBuilder csvdata = new StringBuilder();
        csvdata.AppendLine(header);

        foreach (var o in objectlist) 
            csvdata.AppendLine(ToCsvFields(separator, fields, o));

        return csvdata.ToString();
    }

    public static string ToCsvFields(string separator, FieldInfo[] fields, object o)
    {
        StringBuilder linie = new StringBuilder();

        foreach (var f in fields)
        {
            if (linie.Length > 0)
                linie.Append(separator);

            var x = f.GetValue(o);

            if (x != null)
                linie.Append(x.ToString());
        }

        return linie.ToString();
    }

许多变化可以由，如在ToCsv直接写出到文件中（），或具有一个IEnumerable和产量语句取代的StringBuilder

Many variations can be made, such as writing out directly to a file in ToCsv(), or replacing the StringBuilder with an IEnumerable and yield statements.

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