格式化字符串对象的最佳方法

Question

我想创建一个像这样的字符串对象

string data = "85-null-null-null-null-price-down-1-20";   // null if zero

我有这样的方法.

 public static DataSet LoadProducts(int CategoryId, string Size, 
                                   string Colour, Decimal LowerPrice, 
                                   Decimal HigherPrice, string SortExpression, 
                                   int PageNumber, int PageSize, 
                                   Boolean OnlyClearance)
 {
      /// Code goes here 
      /// i am goona pass that string to one more method here

      var result = ProductDataSource.Load(stringtoPass) // which accepts only the above format

 }

我知道我可以使用a StringBuilder,但使用它需要太多代码行.我在这里寻找一个简约的解决方案.

Answer 1

你可以这样做:

return string.Format("{0}-{1}-{2}-{3}-{4}-{5}-{6}-{7}-{8}",
                     CategoryId,
                     Size ?? "null", 
                     Colour ?? "null",
                     LowerPrice != 0 ? LowerPrice.ToString() : "null",
                     HigherPrice != 0 ? HigherPrice.ToString() : "null",
                     SortExpression ?? "null",
                     PageNumber != 0 ? PageNumber.ToString() : "null",
                     PageSize != 0 ? PageSize.ToString() : "null", 
                     OnlyClearance);

为方便起见,您可以创建扩展方法:

public static string NullStringIfZero(this int value)
{
    return value != 0 ? value.ToString() : "null";
}

public static string NullStringIfZero(this decimal value)
{
    return value != 0 ? value.ToString() : "null";
}

并使用它们如下:

return string.Format("{0}-{1}-{2}-{3}-{4}-{5}-{6}-{7}-{8}",
                     CategoryId,
                     Size ?? "null", 
                     Colour ?? "null",
                     LowerPrice.NullStringIfZero(),
                     HigherPrice.NullStringIfZero(),
                     SortExpression ?? "null",
                     PageNumber.NullStringIfZero(),
                     PageSize.NullStringIfZero(),
                     OnlyClearance);

Answer 2

string foo = String.Format("{0}-{1}-{2}-{3}-{4}-{5}-{6}-{7}-{8}",
                           CategoryId,
                           Size ?? "null" ... );