c#窗体程序个人通讯录

Question

求按姓名模糊查询和按性别模糊查询的代码，以及（增删改的代码，我的代码运行一点开就乱码了）
删除所选联系人代码：

        private void button2_Click(object sender, EventArgs e)
        {
            string name = textBox1.Text;
            string filePath = dizhi;
            string tempFilePath = Path.GetTempFileName();
            using (StreamReader reader = new StreamReader(filePath))
            {
                using (StreamWriter writer = new StreamWriter(tempFilePath))
                {
                    string line;
                    while ((line = reader.ReadLine()) != null)
                    {
                        string[] parts = line.Split(',');
                        if (parts[0] != name)
                        {
                            writer.WriteLine(line);
                        }
                    }
                }
            }
            File.Delete(filePath);
            File.Move(tempFilePath, filePath);
            textBox1.Text = "";
            textBox2.Text = "";
            textBox3.Text = "";
            textBox4.Text = "";
            textBox5.Text = "";
            using (StreamReader reader = new StreamReader(dizhi, Encoding.Default))
            {
                string line = null;
                listBox1.Items.Clear();
                while ((line = reader.ReadLine()) != null)
                {
                    string[] lineArray = line.Split(',');
                    listBox1.Items.Add(lineArray[0]);
                }
            }
        }

新增：

 private void button3_Click(object sender, EventArgs e)
        {
            using (StreamWriter writer = new StreamWriter(dizhi, true, Encoding.Default))
            {
                string line = textBox1.Text + "," + textBox2.Text + "," + textBox3.Text + "," + textBox4.Text + "," + textBox5.Text;
                writer.WriteLine(line);
            }
            using (StreamReader reader = new StreamReader(dizhi, Encoding.Default))
            {
                string line = null;
                listBox1.Items.Clear();
                while ((line = reader.ReadLine()) != null)
                {
                    string[] lineArray = line.Split(',', ',', ',', ',');
                    listBox1.Items.Add(lineArray[0]);
                }
            }
        }

修改：

private void button4_Click(object sender, EventArgs e)
        {
            string name = textBox1.Text;
            string sex = textBox2.Text;
            string home = textBox3.Text;
            string phone = textBox4.Text;
            string qq = textBox5.Text;
            string filePath = dizhi;
            string tempFilePath = Path.GetTempFileName();
            using (StreamReader reader = new StreamReader(filePath))
            {
                using (StreamWriter writer = new StreamWriter(tempFilePath))
                {
                    string line;
                    while ((line = reader.ReadLine()) != null)
                    {
                        string[] parts = line.Split(',');
                        if (parts[0] != name)
                        {
                            writer.WriteLine(line);
                        }
                    }
                }
            }
            File.Delete(filePath);
            File.Move(tempFilePath, filePath);
            using (StreamWriter writer = new StreamWriter(dizhi, true, Encoding.Default))
            {
                string line = textBox1.Text + "," + textBox2.Text + "," + textBox3.Text + "," + textBox4.Text + "," + textBox5.Text;
                writer.WriteLine(line);
            }
            using (StreamReader reader = new StreamReader(dizhi, Encoding.Default))
            {
                string line = null;
                listBox1.Items.Clear();
                while ((line = reader.ReadLine()) != null)
                {
                    string[] lineArray = line.Split(',', ',', ',', ',');
                    listBox1.Items.Add(lineArray[0]);
                }
            }
        }

Answer 1

• 这有个类似的问题, 你可以参考下: https://ask.csdn.net/questions/7808096
• 我还给你找了一篇非常好的博客，你可以看看是否有帮助，链接：C#窗体应用利用文本框对数据库一行多个数据进行增、删、该、查相关语句代码
• 除此之外, 这篇博客: C# 构造函数和析构函数中的 构造函数和析构函数是C#类中的一块，具体的作用和定义，百度，这里只用代码说一下一些具体的区别。 部分也许能够解决你的问题, 你可以仔细阅读以下内容或跳转源博客中阅读:
  

•  

      public class ABC //一个随意的自定义类
      {
          private double a;
          public double A
          {
              get { return a; }
              set
              {
                  a = value;
                  Console.WriteLine("A={0}", a);
              }
          }
          public ABC()
          {
              Console.WriteLine("构造函数ABC被触发");
          }
          ~ABC()
          {
              Console.WriteLine("构析函数ABC~被触发");
          }
      }
      
      class Program
      {
          static void Main(string[] args)
          {
  
              ABC _abc;
  
              Console.WriteLine("A有了，按任意键初始化A");
              Console.ReadLine();
  
              _abc = new ABC() { A = 12 };//初始化对象并赋一个值
  
  
  
  
              Console.WriteLine("按任意键，清除A的值");
              Console.ReadLine();
  
  
              _abc = null;//释放A所占的内存
  
  
              if (_abc == null)
                  Console.WriteLine("A==null");
              else
                  Console.WriteLine("A的值为：{0}", _abc.A);
              Console.WriteLine("按任意键，回收A");
              Console.ReadLine();
  
  
              GC.Collect();//启动垃圾回收机制，回收不需要的对象A
              Console.ReadLine();
          }
      }

  

  上述代码说明：

  1.构造函数在类实例化的时候被触发

  2.析构函数在类被回收的时候触发

      class Program
      {
          static void Main(string[] args)
          {
  
              Third third = new Third();
              third = null;
              GC.Collect();
  
              Console.ReadLine();
          }
      }
  
      public  class First                     // 基类First
      {
          public First()
          {
              Console.WriteLine("~First()构造函数");
          }
          ~First()                    // 析构函数
          {
              Console.WriteLine("~First()析构函数");
          }
      }
      public class Second : First            // Second类从First类派生
      {
          public Second()
          {
              Console.WriteLine("~Second()构造函数");
          }
          ~Second()                   // 析构函数
          {
              Console.WriteLine("~Second()析构函数");
          }
      }
      public class Third : Second            // Third类从Second类派生
      {
          public Third()
          {
              Console.WriteLine("~Third()构造函数");
          }
          ~Third()                    // 析构函数
          {
              Console.WriteLine("~Third()析构函数");
          }
      }

  

  上述代码说明：

  1.子类的生成和回收会触发父类的构造函数和析构函数

  2.构造函数的调用从父类开始，二析构函数则相反

   

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