问题描述

在我的程序中，我允许用户输入一些文本，然后使用 graphics.DrawString() 方法将这些文本放在图像之上.当我然后去保存这个图像时，它会保存它而不保存文本.

In my program i allow the user to enter some text which then gets put on top of an image using the graphics.DrawString() method. When i then go to save this image, it saves it without the text.

如何将两者保存为一张图片?

How can i save both as one image?

我看过一些例子，但都没有帮助.

I have seen a few examples but none of which have helped.

private void txtToolStripMenuItem_Click(object sender, System.EventArgs e)
    {
        Rectangle r = new Rectangle(535, 50, original_image.Width, original_image.Height);
        Image img = Image.FromFile("C:\PCB.bmp");

        Bitmap image = new Bitmap(img);

        StringFormat strFormat = new StringFormat();

        strFormat.Alignment = StringAlignment.Center;
        strFormat.LineAlignment = StringAlignment.Center;

        Graphics g = Graphics.FromImage(image);

        g.DrawString("Hellooooo", new Font("Tahoma", 40), Brushes.White,
                r, strFormat); 

        image.Save("file_PCB.Bmp", ImageFormat.Bmp);
    }

推荐答案

那是因为您正在创建一个没有画布的图形对象.你什么都没有画，所以你画的文字不会改变任何东西.

That's because you are creating a graphics object without a canvas. You are drawing on nothing, so there is nothing that is changed by your drawing the text.

首先创建图像的副本(或创建空白位图并在其上绘制图像)，然后创建用于在该图像上绘制的图形对象:

First create a copy of the image (or create a blank bitmap and draw the image on it), then create a graphics object for drawing on that image:

Graphics g = Graphics.FromImage(image_save);

然后绘制文本并保存图像.

Then draw the text and save the image.

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