Why Doesn't `string.Replace` Modify the Original String in .NET?

.NET string operation detailed explanation: Why

cannot modify the original string? string.Replace

Question: The method cannot modify the string

Replace In the following code fragment,

Method seems to be unable to modify the string:

string.Replace

Even if the parameters are effective, the string remains unchanged.

string someTestString = "<a href=\"myfoldert/108716305-1.jpg\" target=\"_blank\">108716305-1.jpg</a>";
someTestString.Replace("108716305", "NewId42");

Explanation The string in

.NET is immutable, which means that their content cannot be directly modified. When calling , it creates a new string containing the replacement value, rather than modifying the original string.

Solution

To update the string, you need: string.Replace

Store the results of in a new variable:

1. If you want to observe the behavior of "string has been updated", restart the original variable: string.Replace

var newString = someTestString.Replace(someID.ToString(), sessionID);

It should be noted that this is suitable for all string operating functions in .NET, such as

,
2. ,
, and

variants, because they all return a new string and Not operating the original string.

someTestString = someTestString.Replace(someID.ToString(), sessionID);

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