C# 在字符串中搜索扩展 ascii 字符

Question

I have a file that I am searching for specific ascii characters.

I ran the following code after getting the text from a file:

var t = text.IndexOf((char)128);

Hexedit shows I have characters of HEX 80 which is ascii character 128, but t ends up with a value of -1.

Is there another way I should be searching for this character?

Answer 1

I found I had to make a change to my encoding appropriately like the following in order be able to search the string as I expect to. In my case it was the following:

var text = File.ReadAllText(filename, Encoding.UTF7);