将winform.cs的struct变量传递给class [英] pass struct variable of winform.cs into class

问题描述

我将结构转换为form1 [Design]背后的代码。

i made structure into code behind of form1[Design].

struct ImagedetailsStructure
{
   internal UInt32 Imagesize;
   internal UInt16 versionNum;
}

然后创建struct i的对象form1.cs（form1 [Design]后面的代码）。

then create object of struct i the form1.cs(code behind of form1[Design]).

ImageHeaderStructure IHS = new ImageHeaderStructure();

然后我在此使用此变量也是在form1.cs中创建的函数。

then i use this variable in the function that is also made in form1.cs.

public void Imagedetails()
{
   try
   {
       openDialogueBox();
       using (StreamReader sr = new StreamReader(path))
       {
           string ReadImageData = sr.ReadToEnd();
           byte[] readImageDataIntoBytes = StringToByteArray(ReadImageData);
           calculateDataLength = Convert.ToUInt32(readImageDataIntoBytes.Length);
       }
       IHS.Imagesize = calculateDataLength - 16;
       IHS.versionNum = 0x00ff0f;
   }
   catch
   { }
}

我把这个函数调成了class1。



和struct Imagedetailstructure的变量是我想得到的imagesize和versionnumber值。

但是如果我正在创建结构对象并访问变量值即将到来0.

但我想得到IHS.ImageSize的值。在imagedetail函数中分配。



请帮助我。

the i called this function into class1.

and the variable of struct Imagedetailstructure is imagesize and versionnumber values i want to get.
but if i am creating object of structure and accessing the values of variable its coming 0.
but i want to get the values of IHS.ImageSize. that assigned in imagedetail function.

please help me.

推荐答案

你是通过引用来获取的。与价值类型问题。最近有一些关于它的讨论 - 我的经验法则：当你可以在C＃中使用类时，永远不要使用struct。我认为你没有理由使用结构（更有可能你来自另一种语言，就像我做的那样......）。如果要将指针传递给valuetype arround，请在参数定义和调用中使用ref（或out）关键字。但不要，只需更改为类，它将按预期工作 - 我假设（您没有显示相关代码 - 您将调用的代码转换为class1）。



Off-Topic：很有趣，即使对于快速示例我也用有意义的名称命名我的所有对象（表单，类，...），并且对于生产我有一个编码规则（FXCop）变量不能像类名+数字一样命名（比如button1和所有VS设计器默认值），因为如果有人没有找到时间来命名按钮，那么后面的代码质量很高（ Click-handler无论如何也不是好......

Quite shure you got traped by reference vs. value type problem. Had some discussions about it lately - my rule of thumb: never use struct when you can use class in C#. I see no reason for you using a struct (more likely you come from another "language" like I did...). If you want to pass the pointer to a valuetype arround use ref (or out) keyword in the parameter definition and on the call. But don't, just change to class and it will work as you expect - I assume (you did not show the relevant code - the code where you make the call "into class1").

Off-Topic: Funny, even for quick examples I name all my "objects" (Forms, Classes, ...) with meaningfull names, and for production I have a coding rule (FXCop) that a variable can't be named like the class name + number (like button1 and all the VS designer defaults), cause if someone didn't find the "time" to name the "button" chances are high the quality of the code behind (Click-handler whatever) isn't "good" too...

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