Question

考虑以下代码（动态创建动态 SQL字符串）

有没有办法进一步压缩string.join，所以它会自动替换（“'”，“''”）所有数组成员？（不编写自定义版本）

C＃：

[STAThread()]
public void Main()
{
    string[] astrAllGroups = {
        "Group A",
        "Group B",
        "D'Amato",
        null
    };

    for (int i = 0; i < astrAllGroups.Length; ++i) {
        if (!string.IsNullOrEmpty(astrAllGroups[i])) {
            astrAllGroups[i] = astrAllGroups[i].Replace("'", "''");
        }
    }

    string strDynSQL = "'" + string.Join("', '", astrAllGroups) + "'";
    strDynSQL = strDynSQL.Replace("'", "''");
    System.Windows.Forms.Clipboard.SetText(strDynSQL);
    Console.WriteLine(strDynSQL);


    Console.WriteLine(Environment.NewLine);
    Console.WriteLine(" --- Press any key to continue --- ");
    Console.ReadKey();
}

VB.NET

<STAThread()> _
Sub Main()
    Dim astrAllGroups As String() = {"Group A", "Group B", "D'Amato", Nothing}

    For i As Integer = 0 To astrAllGroups.Length - 1 Step 1
        If Not String.IsNullOrEmpty(astrAllGroups(i)) Then
            astrAllGroups(i) = astrAllGroups(i).Replace("'", "''")
        End If
    Next

    Dim strDynSQL As String = "'" + String.Join("', '", astrAllGroups) + "'"
    strDynSQL = strDynSQL.Replace("'", "''")
    System.Windows.Forms.Clipboard.SetText(strDynSQL)
    Console.WriteLine(strDynSQL)


    Console.WriteLine(Environment.NewLine)
    Console.WriteLine(" --- Press any key to continue --- ")
    Console.ReadKey()
End Sub

Answer 1

您可以使用LINQ：

string strDynSQL = "'" + string.Join("', '", 
                       astrAllGroups.Select(s => s.Replace("'", "''"))
                   ) + "'";

如果您不使用.Net 4，则需要添加.ToArray()

Answer 2

只要您使用的是.NET 3或更高版本，就可以使用LINQ：

var strDynSql = 
    "'"
    + String.Join("', '", 
                  astrAllGroups.Select(s => s.Replace("'","''")).ToArray())
    + "'";

进一步紧凑的string.join所以它取代了撇号？

2 个答案: