V3138. String literal contains potential interpolated expression.

The analyzer has detected a string that could contain an interpolated expression, but there is no interpolation character '$' before the literal. Consider the following snippet:

string test = "someText";
....
Console.WriteLine("{test}");

Because of the absent '$' character before the string declaration, the console will simply output the name of the variable. This is the correct notation:

string test = "someText";
....
Console.WriteLine($"{test}");

Strings with expressions inside them are also treated as potential errors:

int a = 1;
int b = 1;
string test = "{a:c} test";
string test1 = "{a+b} test1 {{{ a + b }}}";

However, an exception is made for string literals passed as arguments to methods whose other arguments are variables contained in that same literal.

string test1 = ReplaceCustom("someText {test}", "{test}", test);

In cases like this, the expression in the literal is often a placeholder for the value of the variable passed along with it to the same method.

You can look at examples of errors detected by the V3138 diagnostic.


Bugs Found

Checked Projects
409
Collected Errors
14 072
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