如何使用 C# 查找符号后面的字母是大写还是另一个符号

Question

I'm a beginner in C# (and in coding in general), so I'm sorry if this question is silly.

I have to find if a letter following every / in this string is either an uppercase or another /.

string root = @"C:/File1/File2/File3/file1.txt"

And display the wrong character and its index:

if (Char.IsLower(root[c])) ;
{
Console.WriteLine("There is an error!");
Console.WriteLine(Char.IsLower(root[c]) + " is in lowercase!");
}

I tried with Char.IsUpper() and str.IndexOf() but I can't combine the strings and chars, and I don't know how to find the examinated character:

int at;
int startIndex = 0;
at = root.IndexOf("/", startIndex);
int c = at + 1;

if (Char.IsUpper(c));

Answer 1

To get the char at a given index in a string, you use the string index property:

char charAtCIndex = root[c];

So you can do

if(char.IsUpper(root[c]) || root[c]=='/')
{
    //Do your stuff
}

It is a good practise though to check if the index if within the string length, as if the / is the last character of the string you'll get an Index out of range exception:

if(c < root.Length && (char.IsUpper(root[c]) || root[c]=='/'))
{
    //Do your stuff
}