C#将变量传递给类,然后以形式返回类输出

本文关键字:返回 输出 然后 变量 | 更新日期: 2023-09-27 17:59:51

我很难思考如何在类之间来回传递数据。我参加了一些大学课程OOP入门、C++入门、C#入门,并完成了一些自定进度的在线教程。我相信我掌握了什么时候使用类,但没有掌握如何使用它们。所以这就是我要做的,我只需要一点关于如何实现这一点的指导。请不要告诉我去谷歌,因为我已经搜索到手指流血了(好吧,不是字面意思),现在只需要更多的内容,比如特定的术语。如果有人能用C#术语向我解释,那将是有帮助的,因为我将有一些特定的东西可以重新开始搜索。

这就是我现在的处境…

我写了一个应用程序,它把所有东西都放在同一个类(Form1)中并让它工作。我使用的是下拉列表中的值,这些值预生成数据库查询并分配一些变量,用于播放视频。

这是我在Form1 中的完整代码

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlServerCe;
namespace Tests
{
public partial class Tests : Form
{
    public Tests()
    {
        InitializeComponent();

        using (var conn = new SqlCeConnection("Data Source=TestDB.sdf;Password=;Persist Security Info=True"))
        {
            conn.Open();
            var comm = new SqlCeCommand("SELECT DISTINCT ColumnOne FROM main", conn);                
            SqlCeDataReader reader = comm.ExecuteReader();
            while (reader.Read())
                columnOneComboBox.Items.Add(reader["ColumnOne"]);
        }
    }
    private void columnOneComboBox_SelectedIndexChanged(object sender, EventArgs e)
    {
        testsListBox.Items.Clear();
        testVideoMediaPlayer.Visible = false;
        var columnOne = columnOneComboBox.SelectedItem.ToString();
        using (var conn = new SqlCeConnection("Data Source=TestDB.sdf;Password=;Persist Security Info=True"))
        {
            conn.Open();
            var comm = new SqlCeCommand("SELECT * FROM main WHERE ColumnOne='" + columnOne + "' ORDER BY ColumnTwo", conn);
            SqlCeDataReader reader = comm.ExecuteReader();
            while (reader.Read())
                testsListBox.Items.Add(reader["ColumnTwo"]);
        }
    }
    private void TestListBox_SelectedIndexChanged(object sender, EventArgs e)
    {
        var columnTwo = testsListBox.SelectedItem.ToString();
        using (var conn = new SqlCeConnection("Data Source=TestDB.sdf;Password=Tr@1n!ng;Persist Security Info=True"))
        {
            conn.Open();
            var comm = new SqlCeCommand("SELECT * FROM main WHERE ColumnTwo='" + columnTwo + "'", conn);
            SqlCeDataReader reader = comm.ExecuteReader();
            if (reader.Read())
            {
                bodyPositionRichTextBox.Text = reader["ColumnThree"].ToString();
                techniqueRichTextBox.Text = reader["ColumnFour"].ToString();
                string videoPath = reader["Video"].ToString();
                if (videoPath != "")
                {
                    testVideoMediaPlayer.URL = @"Videos/" + videoPath;
                    testVideoMediaPlayer.settings.playCount = 1000;
                    testVideoMediaPlayer.uiMode = "none";
                    testVideoMediaPlayer.Visible = true;
                    testVideoMediaPlayer.stretchToFit = true;
                    testVideoMediaPlayer.fullScreen = false;
                }
                else
                {
                    testVideoMediaPlayer.Visible = false;
                }
            }
        }
    }
}
}

现在,我想做的是创建一个名为MediaPlayer的单独类,但我需要在指定了所有视频控件的MediaPlayer类中使用Form1中的一个变量,然后让From1调用该播放器。以下是我想转到MediaPlayer.cs:的想法

                if (videoPath != "")
                {
                    testVideoMediaPlayer.URL = @"Videos/" + videoPath;
                    testVideoMediaPlayer.settings.playCount = 1000;
                    testVideoMediaPlayer.uiMode = "none";
                    testVideoMediaPlayer.Visible = true;
                    testVideoMediaPlayer.stretchToFit = true;
                    testVideoMediaPlayer.fullScreen = false;
                }
                else
                {
                    testVideoMediaPlayer.Visible = false;
                }

我是不是搞错了?我不知道如何将字符串变量"Videos"从Test.cs传递到MediaPlayer.cs,也不知道如何从Test.cs调用MediaPlayer.cs。感谢您提供的任何指导。

C#将变量传递给类,然后以形式返回类输出

您的类MediaPlayer如下(替换您的组件类型):

public class MediaPlayer
{
    /* your video type */ TestVideoMediaPlayer { get; set; }
    public MediaPlayer(/* your video type */ testVideoMediaPlayer)
    {
        TestVideoMediaPlayer = testVideoMediaPlayer;
    }
    public void SetMediaPlayer(string url, int playerCount, string uiMode, bool visible, bool stretch, bool fullScreen)
    {
         if (url != "")
            {
                TestVideoMediaPlayer.URL = @"Videos/" + url;
                TestVideoMediaPlayer.settings.playCount = playerCount;
                TestVideoMediaPlayer.uiMode = uiMode;
                TestVideoMediaPlayer.Visible = visible;
                TestVideoMediaPlayer.stretchToFit = stretch;
                TestVideoMediaPlayer.fullScreen = fullScreen;
            }
            else
            {
                TestVideoMediaPlayer.Visible = false;
            }
    }
}

并将您的电话替换为:

 if (reader.Read())
 {
      bodyPositionRichTextBox.Text = reader["ColumnThree"].ToString();
      techniqueRichTextBox.Text = reader["ColumnFour"].ToString();
      string videoPath = reader["Video"].ToString();
      MediaPlayer mp = new MediaPlayer(testVideoMediaPlayer);
      mp.SetMediaPlayer(videoPath, 1000, "none", true, true, false);
 }