小编hax*_*mer的帖子

好吧,我正在尝试做的基本思路是将字节数组转换为short或int等.

一个简单的例子可能是:

        unsafe
        {
            fixed (byte* byteArray = new byte[5] { 255, 255, 255, 126, 34 })
            {
                short shortSingle = *(short*)byteArray;
                MessageBox.Show((shortSingle).ToString()); // works fine output is -1
            }
        }

好的,所以我真正要做的是,对Stream类进行扩展; 扩展的读写方法.我需要以下代码的帮助:

unsafe public static T Read<T>(this Stream stream)
        {
            int bytesToRead = sizeof(T); // ERROR: Cannot take the address of, get the size of, or declare a pointer to a managed type ('T')
            byte[] buffer = new byte[bytesToRead];
            if (bytesToRead != stream.Read(buffer, 0, bytesToRead))
            {
                throw new Exception(); …

List<bool> test = new List<bool>();
test.Sort(new Func<bool, bool, int>((b1, b2) => 1));

我错过了什么？

错误2参数1:无法从'System.Func'转换为'System.Collections.Generic.IComparer'

错误1'System.Collections.Generic.List.Sort(System.Collections.Generic.IComparer)'的最佳重载方法匹配有一些无效的参数

当我有

private int func(bool b1, bool b2)
{
    return 1;
}

private void something()
{
    List<bool> test = new List<bool>();
    test.Sort(func);
}

它工作正常.他们不是一回事吗？

private SortedList<ToolStripMenuItem, Form> forms = new SortedList<ToolStripMenuItem, Form>();                

private void MainForm_Load(object sender, EventArgs e)
{
   formsAdd(menuCommandPrompt, new CommandPrompt());
   formsAdd(menuLogScreen, new LogScreen()); //Error
}

private void formsAdd(ToolStripMenuItem item, Form form)
{
   forms.Add(item, form); //Failed to compare two elements in the array.
   form.Tag = this;
   form.Owner = this;
}

我无法理解为什么它会抛出错误.第二行表单加载事件发生错误.

formsAdd方法只是将form和toolstip元素添加到数组(表单)并将表单的标记和所有者设置为此.在第二次调用函数时,它会抛出一个错误.

CommandPrompt, LogScreen /* are */ Form //s
menuCommandPrompt, menuLogScreen /* are */ ToolStripMenuItem //s

class Monitor
{
private:
    int rate;

    Monitor(int rate)
    {
        this.rate = rate;
    }
}

这是我的代码.我尝试使用通过构造函数"rate"的本地成员设置私有成员"rate".但是我可以在C#中使用它.

错误是:

表达式必须具有类类型

class Program
{
    static void Main()
    {
        int i = 0;
        whatever x = new whatever(i);
        Console.WriteLine(x);
        i = 1;
        Console.WriteLine(x);
        Console.ReadKey();
    }

    class whatever
    {
       public whatever(object variable)
       {
           this.variable = () => variable.ToString();
       }

       private Func<string> variable;
       public string data;

       public override string ToString()
       {
           data = variable();
           return data;
       }
}

输出:

0
0

我想要做的是更新我的价值.

可能重复:
C#中属性和字段之间的差异

public class Test
{
    public bool testData1;
    public string testData2;
}

要么

public class Test
{
    public bool TestData1 { get; set; }
    public string TestData2 { get; set; }
}

要么

public class Test
{
    private bool testData1;
    private string testData2;

    public bool TestData1 { get { return testData1; } set { testData1 = value; } }
    public string TestData2 { get { return testData2; } set { testData2 = value; } }
}

哪种优化代码更好或更不必要？为什么？

这不是最后一个持有很多不必要的数据吗？

=======编辑: …