windows form表單應用程式，建一個記事本參考代碼，重點是開啟，儲存，另存新檔

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       //當點擊開啟的時候        private string files;  //建一個成員變數，用來儲存開啟的路徑        private void 開啟OToolStripMenuItem_Click(object sender, EventArgs e)        {            //openFileDialog1.Filter = "文字檔|*txt|視頻檔案|*avi;*jpg"; //filter建立一個篩選器            //openFileDialog1.ShowDialog();            DialogResult isok = openFileDialog1.ShowDialog();            if (isok == DialogResult.OK) //判斷是否點擊的開啟按鈕            {                string filename = openFileDialog1.FileName;//擷取檔案路徑,檔案路徑存在FileName裡                //使用流進行檔案讀取                StreamReader sr = new StreamReader(filename); //構建一個streamreader類的對象sr ,檔案路徑作為參數                textBox1.Text = sr.ReadToEnd();   //readtoend方法，把檔案完全讀出                sr.Close();  //流用完一定關閉                files = filename;            }//當點擊另存新檔按鈕的時候        private void 儲存sToolStripMenuItem_Click(object sender, EventArgs e)        {            saveFileDialog1.Filter = "文字檔|*.txt";   //要儲存的檔案格式。Filter檔案篩選器            DialogResult isok = saveFileDialog1.ShowDialog();  //是否點擊儲存按鈕            if (isok==DialogResult .OK)            {                string filename = saveFileDialog1.FileName;                StreamWriter sw = new StreamWriter(filename);                sw.Write(textBox1.Text);                sw.Close(); //流用完一定要關閉            }            MessageBox.Show(saveFileDialog1 .FileName );        }        //當點擊儲存按鈕的時候        private void 另存新檔AToolStripMenuItem_Click(object sender, EventArgs e)        {            if (files == null)            {                DialogResult baocun = saveFileDialog1.ShowDialog();                if (baocun == DialogResult.OK)                {                    string filename = saveFileDialog1.FileName;                    StreamWriter sw = new StreamWriter(filename);                    sw.Write(textBox1.Text);                    sw.Close();                }            }            else            {                StreamWriter sw = new StreamWriter(files);                sw.Write(textBox1.Text);                sw.Close();            }        }  //當點擊顏色的時候        private void 顏色ToolStripMenuItem_Click(object sender, EventArgs e)        {            //colorDialog1.ShowDialog();//顯示顏色對話方塊，要顯示對話方塊都有showdialog這個共同屬性。。 colorDialog1.ShowDialog()會有一個傳回值，用dialogresult這個枚舉類型來接受            DialogResult dr = colorDialog1.ShowDialog();            if (dr==DialogResult .OK)  //判斷是否點擊的確定按鈕            {                this.BackColor = colorDialog1.Color;  //如果僅僅寫這一句代碼，在選完顏色之後點取消，會預設系統裡的一個黑色            }                    }        //點擊檔案瀏覽器擷取路徑        private void 檔案瀏覽器ToolStripMenuItem_Click(object sender, EventArgs e)        {            DialogResult dr = folderBrowserDialog1.ShowDialog();   //接受打卡檔案路徑時的傳回值            if (dr==DialogResult .OK)            {                MessageBox.Show(folderBrowserDialog1.SelectedPath );  //selectedpath擷取路徑的屬性            }        }  //當點擊建立的時候        private void 建立NToolStripMenuItem_Click(object sender, EventArgs e)        {            if (textBox1 .Text .Length>0)            {                saveFileDialog1.ShowDialog();                DialogResult dr = new DialogResult();                if (dr == DialogResult.OK)                {                    string filename = saveFileDialog1.FileName;                    StreamWriter sw = new StreamWriter(filename);                    sw.Write(textBox1.Text);                    sw.Close();                }                else                {                    textBox1.Text = "";                }            }        }

 

windows form表單應用程式，建一個記事本參考代碼，重點是開啟，儲存，另存新檔