winForm 利用saveFileDialog 如何实现另存为功能

Question

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Drawing.Imaging;namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }        private void Form1_Load(object sender, EventArgs e)
        {
        }        private void button1_Click(object sender, EventArgs e)
        {
            using (SaveFileDialog saveFileDialog1 = new SaveFileDialog())
            {
                saveFileDialog1.Title = "另存为";
                saveFileDialog1.InitialDirectory = @"C:\";
                saveFileDialog1.Filter = "图片(*.gif)|*.gif|图片(*.jpg)|*.jpg";
                saveFileDialog1.AddExtension = true;
                if (saveFileDialog1.ShowDialog() == DialogResult.OK)
                {
                    using (Image img = pictureBox1.Image)
                    {
                        img.Save(saveFileDialog1.FileName);
                    }
                }
            }
        }
    }
}

Answer 1

C# codeusing System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Drawing.Imaging;namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }        private void Form1_Load(object sender, EventArgs e)
        {
        }        private void button1_Click(object sender, EventArgs e)
        {
            using (SaveFileDialog saveFileDialog1 = new SaveFileDialog())
            {
                saveFileDialog1.Title = "另存为";
                saveFileDialog1.InitialDirectory = @"C:\";
                saveFileDialog1.Filter = "图片(*.gif)|*.gif|图片(*.jpg)|*.jpg";
                saveFileDialog1.AddExtension = true;
                if (saveFileDialog1.ShowDialog() == DialogResult.OK)
                {
                    using (Image img = pictureBox1.Image)
                    {
                        img.Save(saveFileDialog1.FileName);
                    }
                }
            }
        }
    }
}

Answer 2

提示
Application.Run(new Form1())参数无效

Answer 3

ding  ding  ding  ding  ding 

Answer 4

呵呵，那是启动主窗体，应该是构造函数...这个问题解决请问如何设置文字水印相对Form窗体的位置，不要相对屏幕的位置，还有如何设置文字水印的字体呢？不要跟随图片分辨率的改变而改变

Answer 5

Application.Run(new Form1())参数无效错误参考：
今天用c#做了个绘图小程序，突然在Application.Run(new Form1());处报错说：参数无效 未处理ArgumentException 找了半天，终于找出了错误。我有在paint事件里用到Graphics,代码如下:        private void pictureBox1_Paint(object sender, PaintEventArgs e)        {            Graphics graphics = e.Graphics;//添加引用，而不是创建新对象，所以不需要多此释放（disponse)            Bitmap bitmap_1 = Properties.Resources.p00_1;            Bitmap bitmap_2 = Properties.Resources.p01_1;            bool aaa = false;            for (int i = 1, j = 0; i < 55; j += 12, i++)            {                if (aaa)                {                    graphics.DrawImage(bitmap_1, 20 + j, 40, 60, 85);                    aaa = false;                }                else                {                    graphics.DrawImage(bitmap_2, 20 + j, 40, 60, 85);                    aaa = true;                }            }            //graphics.Dispose();//出错地方            bitmap_1.Dispose();            bitmap_2.Dispose();        }我把红色的地方注释掉就好了 ，相比大家都看出来了。我试图把一个引用（e.graphics)给释放掉。当然会报错了，希望对朋友们有帮助。