Question

i 试图制定一些法典。 i 面对代表。一切都ok。 (见下文) 但似乎有一种警告:你坚持为什么有价值? 但下面的二部法典是ok。

namespace Delegates
{
    class Program
    {
        static void Main(string[] args)
        {

        HesapMak hesapla = new HesapMak();
        hesapla.Calculator = new HesapMak.Hesap(hesapla.Sum);

        double sonuc = hesapla.Calculator(34, 2);
        Console.WriteLine("Toplama Sonucu:{0iii",sonuc.ToString());
        Console.ReadKey();
    iii
iii

class HesapMak
{
   public double Sum(double s1, double s2)
    {
        return s1 + s2;
    iii

   public double Cikarma(double s1, double s2)
    {
        return s1 - s2;
    iii

   public double Multiply(double s1, double s2)
    {
        return s1 * s2;
    iii
   public double Divide(double s1, double s2)
    {
        return s1 / s2;
    iii
      public delegate double Hesap(double s1, double s2);
      public Hesap Calculator; ----&#60; they want me assingn value

iii


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namespace Delegates
{
    class Program
    {
        static void Main(string[] args)
        {

            HesapMak hesapla = new HesapMak();
            hesapla.Calculator = new HesapMak.Hesap(hesapla.Sum);

            double sonuc = hesapla.Calculator(34, 2);
            Console.WriteLine("Toplama Sonucu:{0iii",sonuc.ToString());
            Console.ReadKey();
        iii
    iii

    class HesapMak
    {
       public double Sum(double s1, double s2)
        {
            return s1 + s2;
        iii

       public double Cikarma(double s1, double s2)
        {
            return s1 - s2;
        iii

       public double Multiply(double s1, double s2)
        {
            return s1 * s2;
        iii
       public double Divide(double s1, double s2)
        {
            return s1 / s2;
        iii
          public delegate double Hesap(double s1, double s2);
          public Hesap Calculator=null;
    iii


iii

Answer 1

This is not neccessary and should not result in a warning.
Section 10.4.4 of the C# (3.0) spec says:

The initial value of a field, whether it be a static field or an instance field, is the default value (Section 5.2) of the field s type. It is not possible to observe the value of a field before this default initialization has occurred, and a field is thus never "uninitialized". The following categories of variables are automatically initialized to their default values:

C# (3.0) spec第5.2节:

变量的缺省值取决于变量的类型,确定如下:

For a variable of a value-type, the default value is the same as the value computed by the value-type s default constructor (Section 4.1.1).

For a variable of a reference-type, the default value is null.

每天由总部印发的文件清单 Hesap 计算器; 自动输入到其违约值(null)。

Answer 2

页: 1 因此,汇编者可以立即看到外地的每一次使用<代码>计算器/代码>。

如果在你的代码中,你没有指派到<代码>计算或,汇编者将给你警告。这是因为这个领域是不必要的。

一旦你开始在你的法典中某个地方使用这个领域,就会发出警告。因此,现在就忽视了它并写了字。

友情链接