c# - 具有空值 C# 的 String.Format

Question

我想格式化一个地址。这是我的代码:

address = String.Format("{0}, {1}, {2}, {3}, {4}, {5}, {6}",
                        postalAddress.Line1,
                        postalAddress.Line2,
                        postalAddress.Line3,
                        postalAddress.Line4,
                        postalAddress.Suburb,
                        postalAddress.StateCode,
                        postalAddress.Pcode);

不幸的是，当 Line2、Line3、Line4 为空时，这将生成 116 Knox St, , , , Watson, ACT, 2602。我如何处理空值以获得类似 116 Knox St, Watson, ACT, 2602 的结果？

Answer 1

看起来这样可以更简洁地实现您的目的。

string[] data = new[] { 
    postalAddress.Line1, 
    postalAddress.Line2, 
    postalAddress.Line3, 
    postalAddress.Line4, 
    postalAddress.Suburb, 
    postalAddress.StateCode, 
    postalAddress.Pcode 
};

string address = string.Join(", ", 
                             data.Where(e => !string.IsNullOrWhiteSpace(e));