在Vb.net中将Arraylist转换为字符串

Question

How do I convert an arraylist into a string of comma delimated values in vb.net

I have an arraylist with ID values

arr(0)=1
arr(1)=2
arr(2)=3

I want to convert it into a string

Dim str as string=""
str="1,2,3"

Answer 1

str = string.Join(",", arr.ToArray());

If you need to convert the List to string[] before the string.Join you can do

Array.ConvertAll<int, string>(str.ToArray(), new Converter<int, string>(Convert.ToString));

So...

str = string.Join(",", Array.ConvertAll<int, string>(str.ToArray(), new Converter<int, string>(Convert.ToString)));

Answer 2

作为答案，您可以尝试：

Dim s As String = String.Join(",", TryCast(arr.ToArray(GetType(String)), String()))

Answer 3

You can simply achieve it from GetType and Join Functions.

Dim S = YourArrayList.ToArray(Type.GetType("System.String"))
MessageBox.Show(String.Join(",", S))

Another way is to use FOR EACH Statement to read and store each item of array one by one in a delimited string. (But not recommended)

Dim S as string = ""
For Each item As String In YourArrayList
    S &= item & ", "
Next
MessageBox.Show(S)

Answer 4

将String.Join与逗号分隔符一起使用（ http://msdn.microsoft.com/en-us/library/57a79xd0.aspx ）