C# How to replace empty string with value

Question

C# How to replace empty string with value

Sudip Bhatt 2,281

oldGroupKey = item.Element("GroupKey").Value;
oldGroupKey = oldGroupKey.Replace((string.IsNullOrEmpty(oldGroupKey.Split('~')[2]) ? "0" : oldGroupKey.Split('~')[2]), d.XFundCode);

after executing first line OldGroupKey value look like

Segment Details~Anixter~~NBM~~1~HQ

after Anixter ~~

i have to insert a value inside ~~

string.replace not being able to replace empty string with value because there is no value inside ~~

so tell me how could i replace empty string with value. thanks

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Answer 1

Viorel 122.5K

Check if this example works with empty and non-empty segments:

string old_string = "Segment Details~Anixter~~NBM~~1~HQ";
int position = 2;
string new_value = "SomeCode";

var a = old_string.Split( '~' );

string new_string = string.Join( "~", a.Take( position ).Append( new_value ).Concat( a.Skip( position + 1 ) ) );

Console.WriteLine( old_string );
Console.WriteLine( new_string );

Sudip Bhatt 2,281 Reputation points

2020-12-17T17:37:30.747+00:00

Append( new_value )

Error 279 'System.Collections.Generic.IEnumerable<string>' does not contain a definition for 'Append' and no extension method 'Append' accepting a first argument of type 'System.Collections.Generic.IEnumerable<string>' could be found (are you missing a using directive or an assembly reference?)

i am using VS2013 and .net version 4.5.2

Append throwing compilation error? am i missing any namespace Sir ?

Thanks
Viorel 122.5K Reputation points

2020-12-17T18:30:45.763+00:00
Probably the new Append is not available in your environment. Try Concat:

string new_string = string.Join( "~", a.Take( position ).Concat( new[] { new_value } ).Concat( a.Skip( position + 1 ) ) );
Sudip Bhatt 2,281 Reputation points

2020-12-18T06:47:54.857+00:00

in which .net version Append is available ?

in which version you compose the code ?

Thanks for your help.
Viorel 122.5K Reputation points

2020-12-18T09:10:10.26+00:00

The example was made in .NET Framework 4.8. Append was introduced in version 4.7.1: https://learn.microsoft.com/en-us/dotnet/api/system.linq.enumerable.append.
Sudip Bhatt 2,281 Reputation points

2020-12-18T17:56:56.57+00:00

your new code worked. Thank you Sir.

Answer 2

Kyle Wang 5,531 Microsoft External Staff

Did you want to insert a substring inside the first "~~"?

If so, you can call IndexOf(String) to get the index of "~~". By +1, you can get the index of the second ‘~’.

int index = teststr.IndexOf("~~") + 1;

Then you can call String.Substring Method and operator + to get new string.

string newstr = teststr.Substring(0, index) + "newvalue" + teststr.Substring(index, teststr.Length - index);  
//  Segment Details~Anixter~newvalue~NBM~~1~HQ

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C# How to replace empty string with value

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