在C＃中创建所有ASCII字符的数组

I am currently creating a program that uses arrays to categorize ASCII characters in a text document. I am stuck when it comes to creating the array itself, which is a critical part to the project's functionality. It is also suggested that I make the array out of charfrequency objects, which I know my code for is not quite right for this particular project. I used the code from another similar project, but am unsure how to translate it to a project that reads text from a file. I have included my charfrequency class code for reference as to a general idea of what I'm trying to do. I also need to display the results in a format like this:I am currently creating a program that uses arr