我如何加入一个字符串数组,但首先删除数组中的空元素?

时间:2012-10-08 08:10:25

标签: c# arrays join string

我使用以下内容:

return string.Join("\n", parts);

零件有7个条目,但其中两个是空字符串“”。如何首先删除这两个条目,然后加入剩下的五个?

4 个答案:

答案 0 :(得分:25)

您可以在LINQ中使用Where来选择非空的字符串:

 return string.Join("\n", parts.Where(s => !string.IsNullOrEmpty(s)));

答案 1 :(得分:2)

另一种方法是使用StringSplitOptions.RemoveEmptyEntries:

e.g。

string yourString = "The|quick||brown|||fox|is|here";
char[] delimiter = new char[] { '|' };

string result = string.Join(",", yourString.Split(delimiter, StringSplitOptions.RemoveEmptyEntries));

这给出了:

  

在,见效快,棕色,狐狸,是,这里

@Stefan Steiger:

string yourString = "echo 'foo' | sed '/foo/d;'";

这给出了:

  

echo'foo',sed'/ foo / d;'

这正如我所料。 See the dotnetfiddle of it

答案 2 :(得分:1)

使用LINQ

尝试
string[] hello = new string[] { "ads", "zxc", "wer", "", "wer", "", "243" };
string newString = string.Join("\n", hello.Where(x => x.Trim().Length != 0));
MessageBox.Show(newString);

return string.Join("\n", hello.Where(x => x.Trim().Length != 0));

答案 3 :(得分:0)

在.NET 2.0(无LINQ)中执行此操作,例如对于ReportingServices而不为其编写函数:

C#

string a = "", b = "b", c = "", d = "d", e = "";
string lala = string.Join(" / ",
    string.Join("\u0008", new string[] { a, b, c, d, e }).Split(new char[] { '\u0008' }, System.StringSplitOptions.RemoveEmptyEntries)
);

System.Console.WriteLine(lala);

VB.NET

Dim a As String = "", b As String = "b", c As String = "", d As String = "d", e As String = ""
Dim lala As String = String.Join(" / ", String.Join(vbBack, New String() {a, b, c, d, e}).Split(New Char() {ControlChars.Back}, System.StringSplitOptions.RemoveEmptyEntries))

System.Console.WriteLine(lala)

这假设字符退格不会出现在你的字符串中(通常应该是真的,因为你不能通过键盘输入这个字符)。