CodeGo.net>如何正确排序数据表的字符串数列

我正在尝试对字符串数列进行排序,例如N1,N10,N100,N2,我期望结果为N1,N2,N10,N100,但排序不起作用,我以相同的顺序获得了相同的值N1,N10,N100,N2.

我写了下面的代码.

static class ExtensionMethod
{
    public static DataTable SortAlphaNumeric(this DataTable datatable, string columnName)
    {
        return datatable.AsEnumerable()
                  .OrderBy(r => r.Field<String>(columnName), new CustomComparer())
                  .CopyToDataTable();
    }
}

public class CustomComparer : IComparer<string>
{
    public int Compare(string x, string y)
    {
        var numberX = Regex.Match(x, @"\d+").Value;
        var numberY = Regex.Match(y, @"\d+").Value;

        var alphaX = Regex.Match(x, @"[^a-z]").Value;
        var alphaY = Regex.Match(y, @"[^a-z]").Value;

        if (alphaX.CompareTo(alphaY) == 0)
            return numberX.CompareTo(numberY);
        else if (alphaX.CompareTo(alphaY) < 0)
            return -1;
        return 1;            
    }
}

// Code example
class TestExample
{
    public void Test()
    {
        var dt = new DataTable();
        dt.Columns.Add("AlphaNumeric", Type.GetType("System.String"));
        var row = dt.NewRow();
        row["AlphaNumeric"] = "N1";
        dt.Rows.Add(row);
        row = dt.NewRow();
        row["AlphaNumeric"] = "N10";
        dt.Rows.Add(row);
        row = dt.NewRow();
        row["AlphaNumeric"] = "N100";
        dt.Rows.Add(row);
        row = dt.NewRow();
        row["AlphaNumeric"] = "N2";
        dt.Rows.Add(row);

        var orderedDt = dt.SortAlphaNumeric("AlphaNumeric");
    }
}

解决方法:

在您的比较器中进行更改：

var numberX = int.Parse(Regex.Match(x, @"\d+").Value);
var numberY = int.Parse(Regex.Match(y, @"\d+").Value);

标签：icomparer,linq,c,regex,sorting
来源： https://codeday.me/bug/20191025/1930776.html