Convert query string to key-value pair in .Net

Question

If I have a string like so:

"Name=Irwin&Home=Caribbean&Preference=Coffee"

is there a method in C# that can convert that to a key-value pair similar to Request.QueryString?

Answer 1

您可以尝试使用HttpUtility.ParseQueryString 。

var nvc = HttpUtility.ParseQueryString(yourString);

Answer 2

And now, for the longest LINQ expression...

var dict = "Name=Irwin&Home=Caribbean&Preference=Coffee"
    .Split('&')
    .Select(p => p.Split('='))
    .ToDictionary(p => p[0], p => p.Length > 1 ? Uri.UnescapeDataString(p[1]) : null);

But be aware that it will throw if there are multiple keys with the same name.

If you want to protected yourself from this add:

    .GroupBy(p => p[0]).Select(p => p.First())

just before the .ToDictionary (and after the .Select )

this will take the first key=value of the multiple ones. Change .First() to .Last() to take the last one.

Answer 3

You can also use the ToDictionary() method:

var input = "Name=Irwin&Home=Caribbean&Preference=Coffee";
var items = input.Split(new[] { '&' });
var dict = items.Select(item => item.Split(new[] {'='})).ToDictionary(pair => pair[0], pair => pair[1]);

Answer 4

You are looking for

System.Web.HttpUtility.ParseQueryString

Answer 5

You should be able to split this string based on the ampersands and equals signs, then feed each one into a new KeyValuePair:

Dictionary<string, string> myValues = new Dictionary<string,string>();

string[] elements = myString.Split('=','&');

for(int i=0;i<elements.Length; i+=2)
{
   myValues.Add(elements[i], elements[i+1]);
}

This is simplistic and makes a lot of assumptions about the format of your string, but it works for your example.