• C#:静态字段和静态方法的学习


    最近开始学习C#编程:静态字段和静态方法的学习,windows Form 设计如图1,输入原库存量,单价,销售数量,计算出,现库存量和销售额

                             图 1
    代码实现如下,Form1和Form2功能相同,只不过在,一个类中调用另一个类的静态字段数据时,
      1)通过静态方法返回需要的字段数据,需要建立返回静态方法
      2)通过类名直接应用静态字段数据(前提是字段是public的),不需要建返回静态字段方法
    通过静态方法返回需要的字段数据:
    namespace
    crashRegister { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { int st; int inYanKuCun = Convert.ToInt32(textBox1.Text.Trim()); int inCost = Convert.ToInt32(textBox2.Text.Trim()); int inXianKuCun = Convert.ToInt32(textBox3.Text.Trim()); Among a= new Among(inYanKuCun,inCost); a.MakeIt(inXianKuCun,out st); textBox4.Text = st.ToString(); textBox5.Text = Among.ChuanZhi().ToString(); } private void button2_Click(object sender, EventArgs e) { textBox1.Text = textBox2.Text = textBox3.Text = textBox4.Text = textBox5.Text = ""; } } public class Among { int numYanKuCun; int numCost; static double xiaoShouE; public Among(int m,int n) { this.numYanKuCun = m; this.numCost=n; } static Among() { xiaoShouE=0.0; } public void MakeIt(int num,out int stock) { numYanKuCun -= num; xiaoShouE=numCost*numYanKuCun; stock=numYanKuCun; } static public double ChuanZhi() { return xiaoShouE; } } }
    
    
    
    通过类名访问静态字段的数据:
    1
    namespace crashRegister 2 { 3 public partial class Form1 : Form 4 { 5 public Form1() 6 { 7 InitializeComponent(); 8 } 9 private void button1_Click(object sender, EventArgs e) 10 { 11 int st; 12 int inYanKuCun = Convert.ToInt32(textBox1.Text.Trim()); //在textBox1中输入原库存数量赋值给inYanKuCun. 13 int inCost = Convert.ToInt32(textBox2.Text.Trim());    //在textBox2中输入单价给inCost; 14 int inXianKuCun = Convert.ToInt32(textBox3.Text.Trim()); //在textBox3中输入销售数量给inXianKuCun. 15 Among a= new Among(inYanKuCun,inCost); 16 a.MakeIt(inXianKuCun,out st); 17 textBox4.Text = st.ToString(); 18 textBox5.Text = Among.xiaoShouE.ToString(); 19 20 21 } 22 23 private void button2_Click(object sender, EventArgs e) 24 { 25 textBox1.Text = textBox2.Text = textBox3.Text = textBox4.Text = textBox5.Text = ""; 26 } 27 } 28 public class Among 29 { 30 int numYanKuCun; 31 int numCost; 32 public static double xiaoShouE; 33 public Among(int m,int n) 34 { 35 this.numYanKuCun = m; 36 this.numCost=n; 37 } 38 39 public void MakeIt(int num,out int stock) 40 { 41 numYanKuCun -= num; 42 xiaoShouE=numCost*numYanKuCun; 43 stock=numYanKuCun; 44 45 } 46 47 } 48 }
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  • 原文地址:https://www.cnblogs.com/fftan/p/4533733.html
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