排序时如何在末尾放置空字符串 [英] How to put empty strings at the end when sorting

问题描述

在WebGrid上从A到Z排序一列时，空字符串总是最先出现，所以我有:

When sorting a column on my WebGrid from A to Z, the empty strings always come up first, so I have :

""
""
"A"
"B"

(当然没有引号).

我希望他们最后出现，有一种简单的方法吗?

I want them to come up last, is there a simple way to do this ?

推荐答案

您应该使用如下所示的通用比较委托进行排序:

you should sort with generic Comparison delegate like this one:

private int MyComparison(string x, string y)
    {
        if (string.IsNullOrEmpty(x))
        {
            if (string.IsNullOrEmpty(y))
            {
                // If x is null and y is null, they're 
                // equal.  
                return 0;
            }
            else
            {
                // If x is null and y is not null, y 
                // is greater.  
                return 1;
            }
        }
        else
        {
            // If x is not null... 
            // 
            if (string.IsNullOrEmpty(y))
            // ...and y is null, x is greater.
            {
                return -1;
            }
            //sort them with ordinary string comparison
            else
                return x.CompareTo(y);
        }
    }

List<string> liststring = new List<string>() {"C", "","A","","B"};
liststring.Sort(MyComparison);

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