Question

给出字符串：/Projects/Multiply_Amada/MultiplyWeb/Shared/Home.aspx

我想在第三个/之后删除所有尾随字符，结果是：/Projects/Multiply_Amada/

我想在不使用Split或Charindex的情况下这样做。

Answer 1

好的，你的要求有点难度。那么，这个怎么样：

string RemoveAfterThirdSlash(string str)
{
    return str.Aggregate(
            new {
                sb = new StringBuilder(),
                slashes = 0
            }, (state, c) => new {
                sb = state.slashes >= 3 ? state.sb : state.sb.Append(c),
                slashes = state.slashes + (c == '/' ? 1 : 0)
            }, state => state.sb.ToString()
        );
}

Console.WriteLine(RemoveAfterThirdSlash("/Projects/Multiply_Amada/MultiplyWeb/Shared/Home.aspx"));

Answer 2

string str = "/Projects/Multiply_Amada/MultiplyWeb/Shared/Home.aspx";

string newStr = str.SubString(0,24);

我想这可以回答你的问题！

Answer 3

此代码可以实现您的需求，但我更喜欢使用可用的.NET方法在一行中完成

string str = "/Projects/Multiply_Amada/MultiplyWeb/Shared/Home.aspx";

int index = 0;
int slashCount = 0;

for (int i = 0; i < str.Length; i++)
{
    if (str[i] == '/' && slashCount < 3)
    {
        index = i;
        slashCount++;
    }
}

string newString = str.Substring(index + 1);

Answer 4

因为您正在使用路径，所以可以这样做：

    Public Function GetPartialPath(ByVal input As String, ByVal depth As Integer) As String

        Dim partialPath As String = input
        Dim directories As New Generic.List(Of String)

        Do Until String.IsNullOrEmpty(partialPath)
            partialPath = IO.Path.GetDirectoryName(partialPath)
            directories.Add(partialPath)
        Loop

        If depth > directories.Count Then depth = directories.Count

        Return directories.ElementAt(directories.Count - depth)

    End Function

未经测试。

如何截断.net中的字符串

4 个答案: