自动绘制Texture2D，而无需重复写入多行

Question

I have tried to draw Texture2D s in a line by adding to the x and y coordinates when it gets to the end of the screen. The Draw method doesn't draw multiple sprites it just moves the first one at the speed of 20 instead of drawing one every 20 pixels.

protected override void Draw(GameTime gameTime)
{
    GraphicsDevice.Clear(Color.White);

    // TODO: Add your drawing code here
    spriteBatch.Begin();
    spriteBatch.DrawString(GameText, MenuText, new Vector2(325,75), Color.Red);

    do
    {  
        spriteBatch.Draw(EarthGrass, place, Color.White);
        place.X += 20;
    } while (place.X < 800);
    place.X = -20;
    place.Y += 20;
    do
    {                
        int IDBint = IDB.Next(11);
        if (IDBint == 10)
        {
            spriteBatch.Draw(PooperMachoOre, place, Color.White);
        }
        else
        {
            spriteBatch.Draw(EarthDirt, place, Color.White); 
        }
        place.X += 20; 

    } while (place.X < 800);
    place.X = -20;
    place.Y += 20;
    spriteBatch.End();
    base.Draw(gameTime);
}

Answer 1

Your code looks fine at first glance, even though I barley see do loops these days. I assume you want to STOP drawing after the X position is more than 460 pixels, since it starts at 0. So simply flip your > to a < , you will also need to reset your X position each frame, or else it will start where it left off.

do
{
     place.X += 20;
     spriteBatch.Draw(EarthGrass, place, Color.White);
} while (place.X > 460);
place.X = 0;

Answer 2

If you do:

do
{                
    int IDBint = IDB.Next(11);
    if (IDBint == 10)
        spriteBatch.Draw(PooperMachoOre, place, Color.White);
    else
        spriteBatch.Draw(EarthDirt, place, Color.White);

    place.X += 20;

} while (place.X < 800);

your Draw will change all the sequence of images to draw every frame (and as Cyral wrote, it happens 60 times per second).
You don't have to call your random generator in the Draw method, but you have to set the sequence of textures to draw only once. In the Initialize , for example.