Question

所以我终于想出了如何绑定我想在我的音板上绑定的按钮，但现在代码给了我一个错误。

Severity Code Description Project File Line
Warning CS0642 Possible mistaken empty statement WindowsFormsApplication6 C:\Users\User\Documents\Visual Studio 2015\Projects\WindowsFormsApplication6\Form1.cs 125

我觉得我错过了什么，但我真的无法看到我错过了什么。我尝试了一些不同的解决方案，但它对我没有任何好处，我尝试了一些试验和错误，这让我最终回到了这里。

    using System;
    using System.Collections.Generic;
    using System.ComponentModel;
    using System.Data;
    using System.Drawing;
    using System.Linq;
    using System.Text;
    using System.Threading.Tasks;
    using System.Windows.Forms;
    /// <summary>
    /// Version: 1.0
    /// Farm SoundBoard
    /// Created By Me
    /// Date 2015-10-29
    /// Category: Fun
    /// </summary>
    namespace WindowsFormsApplication6
    {
        public partial class Form1 : Form
        {
            public Form1()
            {
                InitializeComponent();
            }

            private void Form1_Load(object sender, EventArgs e)
            {
            }

            private void button1_Click(object sender, EventArgs e)
            {
                System.Media.SoundPlayer player = new System.Media.SoundPlayer();
                player.Stream = Properties.Resources.cow;
                player.Play();
            }

            private void button2_Click(object sender, EventArgs e)
            {
                System.Media.SoundPlayer player = new System.Media.SoundPlayer();
                player.Stream = Properties.Resources.bird;
                player.Play();
            }

            private void button3_Click(object sender, EventArgs e)
            {
                System.Media.SoundPlayer player = new System.Media.SoundPlayer();
                player.Stream = Properties.Resources.bee;
                player.Play();
            }

            private void button4_Click(object sender, EventArgs e)
            {
                System.Media.SoundPlayer player = new System.Media.SoundPlayer();
                player.Stream = Properties.Resources.elephant;
                player.Play();
            }

            private void button5_Click(object sender, EventArgs e)
            {
                System.Media.SoundPlayer player = new System.Media.SoundPlayer();
                player.Stream = Properties.Resources.tiger;
                player.Play();
            }

            private void button6_Click(object sender, EventArgs e)
            {
                System.Media.SoundPlayer player = new System.Media.SoundPlayer();
                player.Stream = Properties.Resources.cat;
                player.Play();
            }

            private void button7_Click(object sender, EventArgs e)
            {
                System.Media.SoundPlayer player = new System.Media.SoundPlayer();
                player.Stream = Properties.Resources.dog;
                player.Play();
            }

            private void button8_Click(object sender, EventArgs e)
            {
                System.Media.SoundPlayer player = new System.Media.SoundPlayer();
                player.Stream = Properties.Resources.lion;
                player.Play();
            }

            private void button9_Click(object sender, EventArgs e)
            {
                System.Media.SoundPlayer player = new System.Media.SoundPlayer();
                player.Stream = Properties.Resources.flies;
                player.Play();
            }

            private void button10_Click(object sender, EventArgs e)
            {
                System.Media.SoundPlayer player = new System.Media.SoundPlayer();
                player.Stream = Properties.Resources.fish;
                player.Play();
            }

            private void button11_Click(object sender, EventArgs e)
            {
                System.Media.SoundPlayer player = new System.Media.SoundPlayer();
                player.Stream = Properties.Resources.parrot;
                player.Play();
            }

            private void button12_Click(object sender, EventArgs e)
            {
                System.Media.SoundPlayer player = new System.Media.SoundPlayer();
                player.Stream = Properties.Resources.car;
                player.Play();
            }
            private void button14_Click(object sender, EventArgs e)
            {
                panel1.Visible = true;
            }

            private void button13_Click(object sender, EventArgs e)
            {
                panel1.Visible = false;
            }

        private void Form1_KeyPress(object sender, KeyPressEventArgs e)
        {
            if (e.KeyChar == (char)ConsoleKey.F1) ;

            System.Media.SoundPlayer player = new System.Media.SoundPlayer();
            player.Stream = Properties.Resources.cow;
            player.Play();
        }
    }
 }

Answer 1

问题在于这一行：

if (e.KeyChar == (char)ConsoleKey.F1) ;

如果条件为if，true语句将封装一些代码以仅执行。如果C＃中的语句通常在{ }括号中封装它们的条件代码体。作为礼貌，编译器假定缺少括号意味着条件体中有一行：您编写的下一行代码。在你的情况下，你基本上写了：

if (e.KeyChar == (char)ConsoleKey.F1) { }

因为if语句末尾的;终止了代码行。你可能会这样做：

if (e.KeyChar == (char)ConsoleKey.F1) /* some code here */;

或者这个：

if (e.KeyChar == (char)ConsoleKey.F1) { // Some code here }

Answer 2

所以这就是发生的事情。

我试图允许KeyPreview＆amp;表单属性中的KeyDown＆amp;它没有用，但只要我尝试使用相同的功能添加相同的功能就可以了。

这是有用的

private void Form1_Load(object sender, EventArgs e)
{
    this.KeyPreview = true;
    this.KeyDown += new KeyEventHandler(button1_KeyDown);
}

并且

private void button1_KeyDown(object sender, KeyEventArgs e)
{
    if (e.KeyCode.ToString() == "F1")

    {
        button2_Click(null, null);
    }

所以我仍然需要模拟鼠标按下的按钮，但是它有效！

if（e.KeyChar ==（char）ConsoleKey.F1）;空陈述？ C＃Visual Studio .NET表单

2 个答案: