c# bitmap和new bitmap(bitmap)

问题情境：

　　给picturebox赋image属性，我用一下代码，出错：

Bitmap theBitmap = convertCameraData.display(rawDataArray, height, width, rawImageArray, rgbPalette_256, backgroundTemperature);
            if (theBitmap == null) { return; }
            form_Main.pictureBox1.Image = theBitmap;

 困境辨析：

　　把bitmap赋给pictureBox1.Image不正确，应转为image再进行赋值。

Bitmap theBitmap = convertCameraData.display(rawDataArray, height, width, rawImageArray, rgbPalette_256, backgroundTemperature);
            if (theBitmap == null) { return; }
            form_Main.pictureBox1.Image = new Bitmap(theBitmap);