如何使用包含公共变量的类在C＃中将项添加到列表中(How to add items to a list in C# using a class containing public variables)

我希望你能帮助一个程序员。基本上，我希望将富文本框（taskNameRTB）中的用户输入分配给taskName; 我的类taskStructure字符串变量，如下所示：

public partial class Form1 : Form { public class taskStructure { public string taskName; public string taskDescription; public int Priority; public string dateAndTime; } public List<taskStructure> TasksArray = new List<taskStructure>(); //Declared a list data structure

在我的第二种形式中，用户输入与任务相关的所有内容，我想在单击“创建任务”按钮后将此信息发送到列表：

private void createTaskBtn_Click(object sender, EventArgs e) { Form1 welcomeForm = new Form1(); welcomeForm.TasksArray[0].taskName = taskNameRTB.Text; welcomeForm.TasksArray[0].taskDescription = taskDescRTB.Text; }

但是，当我这样做时，我得到一个ArgumentOutOfRangeException ，我不明白为什么。我也试过这些：

welcomeForm.TasksArray[0].Add(taskDescRTB.Text); welcomeForm.TasksArray.Insert(0, taskNameRTB.Text); welcomeForm.TasksArray.Add(taskDescRTB.Text); taskNameRTB.Text = welcomeForm.TasksArray[0].taskName;

但运行的那些会出现相同的错误ArgumentOutOfRangeException ，其中一些不起作用，例如：

welcomeForm.TasksArray[0].Add(taskDescRTB.Text);

我知道该列表尚未初始化，但如果不允许我使用用户输入初始化它，如何初始化它...

你能解决的任何亮点都会非常有用

亲切的问候，

基兰

I hope you can help out a fellow programmer. Basically, I want the user input from the Rich Text Box (taskNameRTB) to be assigned to the taskName; string variable in my class taskStructure which is in form1 shown below:

public partial class Form1 : Form { public class taskStructure { public string taskName; public string taskDescription; public int Priority; public string dateAndTime; } public List<taskStructure> TasksArray = new List<taskStructure>(); //Declared a list data structure

In my second form which is where the user enters everything related to the task, I want to send this information to the list after the 'Create Task' button has been clicked:

private void createTaskBtn_Click(object sender, EventArgs e) { Form1 welcomeForm = new Form1(); welcomeForm.TasksArray[0].taskName = taskNameRTB.Text; welcomeForm.TasksArray[0].taskDescription = taskDescRTB.Text; }

However, when I do this I get a ArgumentOutOfRangeException and I do not understand why. I have also tried these:

welcomeForm.TasksArray[0].Add(taskDescRTB.Text); welcomeForm.TasksArray.Insert(0, taskNameRTB.Text); welcomeForm.TasksArray.Add(taskDescRTB.Text); taskNameRTB.Text = welcomeForm.TasksArray[0].taskName;

But the ones that run come up with the same error ArgumentOutOfRangeException and some of them don't work, such as:

welcomeForm.TasksArray[0].Add(taskDescRTB.Text);

I'm aware that the list has not been initialized, but how can I initialize it when it doesn't allow me to initialize it with user input...

Any light you can shed on this will be really helpful

Kind Regards,

Kieran

最满意答案

您需要向列表中添加新的taskStructrue 。

welcomeForm.TasksArray.Add(new taskStructure { taskName = taskDescRTB.Text, taskDescription = taskDescRTB.Text });

但就个人而言，我会重写该类以遵循命名约定并使用属性而不是公共字段。

public class TaskStructure { public string TaskName { get; set; } public string TaskDescription { get; set; } public int Priority { get; set; } public string DateAndTime { get; set; } }

You need to add a new taskStructrue to the list.

welcomeForm.TasksArray.Add(new taskStructure { taskName = taskDescRTB.Text, taskDescription = taskDescRTB.Text });

But personally I'd rewrite that class to follow naming conventions and to use properties instead of public fields.

public class TaskStructure { public string TaskName { get; set; } public string TaskDescription { get; set; } public int Priority { get; set; } public string DateAndTime { get; set; } }

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