How does the string replace function in VB.net not work?

Question

I wrote up some code. The code is shown below. The first part is to read a html into string format. The second part is to search a mark in the string and replace the string

Answer 1

Strings are immutable, that means once they are created you cannot modify them. So you have to create a new one and assign that to your string variable:

TempText = TempText.Replace("the_key_string", "replace_by_this_string")

MSDN: String Data Type (Visual Basic):

Once you assign a string to a String variable, that string is immutable, which means you cannot change its length or contents. When you alter a string in any way, Visual Basic creates a new string and abandons the previous one. The String variable then points to the new string.

Answer 2

String.Replace returns new string instead of modifying the source one. You have to assign it back to your variable:

TempText = TempText.Replace("the_key_string", "replace_by_this_string")

From MSDN:

Returns a new string in which all occurrences of a specified string in the current instance are replaced with another specified string.

Answer 3

The Replace method returns the modified string.

You need something like this:

Dim TextPath = C:xxxxxx
TempText = ReadTextFile(TextPath)
Dim ModifiedString as String
ModifiedString = TempText.Replace("the_key_string", "replace_by_this_string")

Answer 4

"this is a string" If you do Replace 'string' with 'whatever' this string should be: "this is a whatever". so what you can do is put that in a new string. how? replace method returns a string so, it is easy :) see this: msdn

Answer 5

You have to assign the value to something, like :

TempText = TempText.Replace("the_key_string", "replace_by_this_string")

Answer 6

This is performing the string replace, but it's not putting the result of it anywhere:

TempText.Replace("the_key_string", "replace_by_this_string")

You need to assign the result to something:

TempText = TempText.Replace("the_key_string", "replace_by_this_string")