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Creating function syntax by manipulating string

I am trying to create dynamic syntax function and function syntax is like below:
MyFunction( arg1,arg2,ar3.....);
I have string like this:
str = Previousvalue.Value1,Previousvalue.Value2
Now I would like to create syntax like this in final variable :
String final = MyFunction(Previousvalue.Value1,',',Previousvalue.Value2);
str = Previousvalue.Value1,Previousvalue.Value2,Previousvalue.Value3;
String final = MyFunction(Previousvalue.Value1,',',Previousvalue.Value2,',',Previousvalue.Value3);
This is how I am trying to achieve with string.join (without using loop) but not getting how to do it and this seems like impossible to do without using loop:
final = string.Join("MyFunction(", str.Split(','));
Case 1:
Input : string str =Previousvalue.Value1,Previousvalue.Value2
Output:
string final=MyFunction(Previousvalue.Value1,',',Previousvalue.Value2,',',Previousvalue.Value3);
Case 2 :
Input : str = Previousvalue.Value1,Previousvalue.Value2,Previousvalue.Value3;
output:
String final = MyFunction(Previousvalue.Value1,',',Previousvalue.Value2,',',Previousvalue.Value3);
Case 3:
string input = " Previousvalue.Value1";
Output:
String final = Previousvalue.Value1; //No function

From what I understand, you want to generate a string like this:
"MyFunction(Previousvalue.Value1,',',Previousvalue.Value2);"
^..........^...................^....^...................^.
prefix arg1 sep arg2 suffix
or in other words
prefix = "MyFunction(";
separator = ",',',";
suffix = ");"
which can be achieved by moving the prefix and suffix out of the string.Join and using the above separator value:
string final = "MyFunction(" + string.Join(",',',", str.Split(',')) + ");";
Also instead of Split / Join you could simply use string.Replace:
string final = "MyFunction(" + str.Replace(",", ",',',") + ");";

From my understanding of the problem you want to call the MyFunction method with n string parameters, but also with string[]. You can do it like this:
public static void Main(string[] args)
{
string str = "Test1,Test2,Test3";
string test1 = MyFunction("Test1", "Test2", "Test3");
string test2 = MyFunction(str.Split(','));
}
public static string MyFunction(params string[] parameters)
{
StringBuilder sb = new StringBuilder();
foreach(var item in parameters)
{
sb.AppendLine(item);
}
return sb.ToString();
}

Try :
public string MyJoin(params string[] vars)
{
return "MyFunction(" + string.Join(",", vars) + ");";
}

C# convert a string to unicode encoding

I need to convert a string i.e. "hi" to & #104;& #105; is there a simple way of doing this? Here is a website that does what I need. http://unicode-table.com/en/tools/encoder/

Try this:
var s = "hi";
var ss = String.Join("", s.Select(c => "&#" + (int)c + ";"));

Try this:
string myString = "Hi there!";
string encodedString = myString.Aggregate("", (current, c) => current + string.Format("&#{0};", Convert.ToInt32(c)));

Based on the answer to this question:
static string EncodeNonAsciiCharacters(string value)
{
StringBuilder sb = new StringBuilder();
foreach (char c in value)
{
string encodedValue = "&#" + ((int)c).ToString("d4"); // <------- changed
sb.Append(encodedValue);
}
return sb.ToString();
}

Grab a part of text when it matches, get rid of the rest because it's useless

I have a text called
string path = "Default/abc/cde/css/";
I want to compare a text.
string compare = "abc";
I want a result
string result = "Default/abc";
The rest of the path /cde/css is useless.Is it possible to grab the desire result in asp.net c#. Thanks.

Is this what you looking for?:
string result = path.Substring(0, path.IndexOf(compare)+compare.Length);

Try this. This will loop through the different levels (assuming these are directory levels) until it matches the compare, and then exit the loop. This means that if there is a folder called abcd, this won't end the loop.
string path = "Default/abc/cde/css";
string compare = "abc";
string result = string.Empty;
foreach (string lvl in path.Split("/")) {
result += lvl + "/";
if (lvl == compare)
{
break;
}
}
if (result.Length>0)
{
result = result.substring(0, result.length-1);
}

string path = "Default/abc/cde/css/";
string answer = "";
string compare = "abc";
if (path.Contains(compare ))
{
answer = path.Substring(0, path.IndexOf(stringToMatch) + compare.Length);
}
Something like the above should work.

I suggest that if you meet questions of this kind in the future, you should try it yourself first.
string result = path.Contains(compare) ? path.Substring(0, (path.IndexOf(compare) + compare.Length)) : path;

parsing a long string in c# and giving those values to parameters

I have this string in C# -
".... School||Abc\r\n...State||CA\r\n..."
The school and state are somewhere in the string. I need to parse the string in such a way that i get the values of School and State for my parameters
string school = abc (from String after parsing)
string state = CA (from string after parsing)

Try this:
string longStr = "School||Abc\r\nState||CA\r\n";
string[] keyValPairs = s.Split("\r\n".ToCharArray());
Dictionary<string, string> info = new Dictionary<string, string>();
foreach(string pair in keyValPairs)
{
string[] split = pair.Split("||");
//split[0] is the key, split[1] is the value
info.Add(split[0], split[1]);
}
Now you can access what you need like so:
string school = info["School"];
string state = info["State"];
Where the longStr variable is just your long string that you start out with, not neccessarily what I set it to.

Try split-ing string on new line chars and then it looks like a dictionary, with key values separated by ||. Another split on "||" should give you what you want.
Back of the envelope code
private static void ParseMyString(string longString) {
IEnumerable<string> shortStrings = longString.Split("\r\n".ToCharArray(), StringSplitOptions.RemoveEmptyEntries);
foreach(var ss in shortStrings) {
var kvp = ss.Split("||".ToCharArray());
Console.WriteLine("{0} - {1}", kvp[0], kvp[1]);
}
}

You can use the TextFieldParser class to parse this file, in particular if it is fixed width fields or has known delimiters.
It:
Provides methods and properties for parsing structured text files.
Though it lives in the Microsoft.VisualBasic.Text namespace, it is a .NET assembly and can be used in all .NET projects.

Assuming that your string just contains values separated by "||", "\r" or "\n".
string str = "School||Abc\r\n||State||CA\r\n||AA||AA";
str = str.Trim();
str = str.Replace("\r",string.Empty);
str = str.Replace("\n", string.Empty);
string[] keyValue = str.Split(new string[] { "||" }, StringSplitOptions.None);
Dictionary<string, string> KeyValDic = new Dictionary<string, string>();
for (int i = 0; i < keyValue.Length; i++,i++)
{
KeyValDic.Add(keyValue[i], keyValue[i + 1]);
}

How do I use the Aggregate function to take a list of strings and output a single string separated by a space?

Here is the source code for this test:
var tags = new List<string> {"Portland", "Code","StackExcahnge" };
const string separator = " ";
tagString = tags.Aggregate(t => , separator);
Console.WriteLine(tagString);
// Expecting to see "Portland Code StackExchange"
Console.ReadKey();
Update
Here is the solution I am now using:
var tagString = string.Join(separator, tags.ToArray());
Turns out string.Join does what I need.

For that you can just use string.Join.

string result = tags.Aggregate((acc, s) => acc + separator + s);
or simply
string result = string.Join(separator, tags);

String.Join Method may be?

This is what I use
public static string Join(this IEnumerable<string> strings, string seperator)
{
return string.Join(seperator, strings.ToArray());
}
And then it looks like this
tagString = tags.Join(" ")