Question

我有一个基本的WinForm，可以在Load事件上加载一些数据有一个尝试捕获和捕获我有以下代码：

BeginInvoke(new MethodInvoker(Close));

问题在于继承的形式＆＃34;加载＆＃34;事件仍然被调用。
我也不能打电话给＃34; Invoke＆＃34;因为我收到的错误是＆＃34;关闭＆＃34;在做＆＃34; CreateHandle＆＃34;。时，不能调用甚至包括这个＆＃34; this.IsHandleCreated＆＃34;没有用。

如何在基础中出现错误时停止加载继承的表单并关闭继承的表单＆＃34;加载＆＃34;事件

更新代码更新
我认为上面列出了足够的信息来解释这个问题，但我想它需要更多的＆＃34;例如＆＃34;代码，所以这里......

这是基本形式

public partial class BaseForm : Form
{
    public BaseForm()
    {
        InitializeComponent();
    }

    private void BaseForm_Load(object sender, EventArgs e)
    {
        try
        {
            // only run this code in RunTime
            if (LicenseManager.UsageMode == LicenseUsageMode.Runtime)
            {
                // load some data
                LoadData();
            }
        }
        catch (Exception ex)
        {
            // handle the exception and tell the user something BUT don't kill the app... a THROW here could kill the app
            HandleException(ex);

            // since we are loading the form we need to exit the form if there is an error loading.
            BeginInvoke(new MethodInvoker(Close)); // can't close a form on load unless using begin invoke
        }
    }
}

这里是基础形式的测试形式

public partial class TestForm : BaseForm
{
    public TestForm()
    {
        InitializeComponent();
    }

    private void TestForm_Load(object sender, EventArgs e)
    {
        // do some work BUT only if the BASE form loaded correctly
        DoSomething();
    }
}

Answer 1

来自＆＃34; Hans Passant＆＃34;在这里链接Form_Load() 'event' or Override OnLoad()
我正在使用＆＃34; OnLoad＆＃34;基本形式的事件，以阻止＆＃34;加载＆＃34;加载时基本表单中存在异常时继承表单的事件。

这是基本形式

public partial class BaseForm : Form
{
    public BaseForm()
    {
        InitializeComponent();
    }

    protected override void OnLoad(EventArgs e)
    {
        try
        {
            // only run this code in RunTime
            if (LicenseManager.UsageMode == LicenseUsageMode.Runtime)
            {
                // load some data
                LoadData();
            }

            // only call the OnLoad event if there is no exception when loading the data of the base form
            base.OnLoad(e);
        }
        catch (Exception ex)
        {
            // handle the exception and tell the user something BUT don't kill the app... a THROW here could kill the app
            HandleException(ex);

            // close the forms
            this.Close();
        }
    }

    private void BaseForm_Load(object sender, EventArgs e)
    {
        // NOTE: any exception handled here will still cause the inherited forms Load event to fire
    }
}

Answer 2

避免在Load事件中调用函数。请尝试使用Shown事件。

Winform基础表单在加载事件

2 个答案: