异常Console.Write行为

Question

Console.Write isn't behaving as it should; I'm trying to create a class that handles drawing to specific regions of the console, and some really odd stuff's been happening. I've got no clue how to debug it.

When I throw this code in:

string output;

for (int i = 0; i < Console.WindowHeight; ++i) {
    Console.SetCursorPosition(0, i);
    output = "";
    for (int j = 0; j < Console.WindowWidth; ++j) output += (i % 10).ToString();
    Console.Write(output);
}

I get the following: http://snag.gy/LrFcU.jpg (I'm not allowed to post images because of reputation limits -.-)

Yet when I modify it like so:

string output;

for (int i = 0; i < Console.WindowHeight; ++i) {
    Console.SetCursorPosition(0, i);
    output = "";

    // take one character away from the string
    for (int j = 0; j < Console.WindowWidth - 1; ++j) output += (i % 10).ToString();

    Console.Write(output);
}

I get this! http://snag.gy/jxLH8.jpg

WindowWidth is 80, WindowHeight is 25, and both buffer width and height are equal to window width and window height.

I'm resetting the cursor position every interation of the outer for loop... Why would it be omitting the first line?

Answer 1

The first line isn't omitted, it's just that it scrolled out of sight.

You're adding one more character in the first version, thus reaching the end of the line and putting the caret on the next line.