C#常用对话框

1、OpenFileDialog：打开文件

        private string GetOpenFileName()
        {
            openFileDialog1 = new OpenFileDialog();
            openFileDialog1.Title = "打开文本文件";
            openFileDialog1.CheckFileExists = true;
            openFileDialog1.CheckPathExists = true;
            openFileDialog1.AddExtension = true;
            openFileDialog1.Multiselect = false;
            openFileDialog1.Filter = " txt files(*.txt)|*.txt|All files(*.*)|*.*";
            //openFileDialog1.FilterIndex = 1;
            if (openFileDialog1.ShowDialog() == DialogResult.OK)
            {
                return openFileDialog1.FileName;
            }
            else
            {
                return null;
            }
        }
        private void OpenFile(string filename)
        {
            try
            {
                FileStream fs = new FileStream(filename, FileMode.Open, FileAccess.Read);
                FileInfo f = new FileInfo(filename);
                StreamReader fileread = new StreamReader(fs, Encoding.Default);
                richTextBox1.Text = fileread.ReadToEnd();
                fileread.Close();
                this.Text = f.Name;
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

2、SaveFileDialog：保存文件

        private string GetSaveFileName()
        {
            saveFileDialog1 = new SaveFileDialog();
            saveFileDialog1.Title = "文件另存为";
            saveFileDialog1.OverwritePrompt = true; //如果文件已存在，弹出提示
            saveFileDialog1.CreatePrompt = true; //如果文件不存在，提示是否创建文件
            saveFileDialog1.AddExtension = true;
            saveFileDialog1.Filter = "txt files(*.txt)|*.txt|All files(*.*)|*.*";
            if (saveFileDialog1.ShowDialog() == DialogResult.OK)
            {
                return saveFileDialog1.FileName;
            }
            else
            {
                return null;
            }
        }
        private void SaveFile(string filename)
        {
            try
            {
                StreamWriter filewrite = new StreamWriter(filename);
                filewrite.Write(richTextBox1.Text);
                filewrite.Close();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

3、FontDialog：字体设置

        private void 字体ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            fontDialog1 = new FontDialog();
            fontDialog1.ShowColor = true;
            fontDialog1.AllowScriptChange = true;
            fontDialog1.AllowVectorFonts = true;
            fontDialog1.ShowEffects = true;
            if (fontDialog1.ShowDialog() == DialogResult.OK && richTextBox1.SelectedText != "")
            {
                richTextBox1.SelectionFont = fontDialog1.Font;
                richTextBox1.SelectionColor = fontDialog1.Color;
            }
        }

4、ColorDialog：颜色设置

        private void 颜色ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            colorDialog1 = new ColorDialog();
            colorDialog1.AllowFullOpen = true;
            colorDialog1.AnyColor = true;
            colorDialog1.FullOpen = true;
            if (colorDialog1.ShowDialog() == DialogResult.OK)
            {
                richTextBox1.BackColor = colorDialog1.Color;
            }
        }