winforms中的异步自动完成

有没有办法在Winforms文本框或组合框中实现异步自动完成？AJAX非常好，如果.NET framework没有与之相当的厚客户端，我会感到惊讶

没有现成的功能，但自己实现应该不会太难。。。处理

TextChanged

事件，异步发送请求以获取匹配项，并在获得结果时更改

AutoCompleteSource

。您只需要小心地使用

Invoke

方法访问UI线程上的UI组件（或者您可以使用

BackgroundWorker

并在

RunWorkerCompleted

事件中访问UI）

没有现成的功能，但自己实现它应该不会太难。。。处理

TextChanged

事件，异步发送请求以获取匹配项，并在获得结果时更改

AutoCompleteSource

。您只需要小心地使用

Invoke

方法访问UI线程上的UI组件（或者您可以使用

BackgroundWorker

并在

RunWorkerCompleted

事件中访问UI）

我知道在MFC中您可以使用，shell将为您完成。然而，我不确定在WinForms中实现这一点的最佳方法，但这应该是可能的

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有关更多信息，请参阅和。

我知道，在MFC中，您可以使用，shell将为您完成这项工作。然而，我不确定在WinForms中实现这一点的最佳方法，但这应该是可能的

---

有关更多信息，请参阅和。

我为文本框编写了一个异步自动完成类：

using System;
using System.Windows.Forms;
using System.Collections.Generic;
using System.Text;
using System.ComponentModel;

namespace TextboxAutocomplete
{
    public abstract class AutoCompleteSource
    {
        private TextBox mTextBox;
        private AutoCompleteMode mAutoCompleteMode;

        public AutoCompleteSource(TextBox textbox) :
            this(textbox, AutoCompleteMode.Suggest) { }

        public AutoCompleteSource(TextBox textbox, AutoCompleteMode mode)
        {
            if (textbox == null)
                throw new ArgumentNullException("textbox");

            if (textbox.IsDisposed)
                throw new ArgumentException("textbox");

            mTextBox = textbox;
            mAutoCompleteMode = mode;

            mTextBox.AutoCompleteSource = System.Windows.Forms.AutoCompleteSource.None;

            BackgroundWorker autoCompleteLoader = new BackgroundWorker();
            autoCompleteLoader.DoWork += new DoWorkEventHandler(autoCompleteLoader_DoWork);
            autoCompleteLoader.RunWorkerCompleted += new RunWorkerCompletedEventHandler(autoCompleteLoader_RunWorkerCompleted);
            autoCompleteLoader.RunWorkerAsync();
        }

        void autoCompleteLoader_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            AutoCompleteStringCollection collection = e.Result as AutoCompleteStringCollection;
            if (collection == null) return;

            if (mTextBox.InvokeRequired)
            {
                mTextBox.Invoke(new SetAutocompleteSource(DoSetAutoCompleteSource), new object[] { collection });
            }
            else
            {
                DoSetAutoCompleteSource(collection);
            }
        }

        protected void DoSetAutoCompleteSource(AutoCompleteStringCollection collection)
        {
            if (mTextBox.IsDisposed) return;

            mTextBox.AutoCompleteMode = mAutoCompleteMode;
            mTextBox.AutoCompleteSource = System.Windows.Forms.AutoCompleteSource.CustomSource;
            mTextBox.AutoCompleteCustomSource = collection;
        }

        void autoCompleteLoader_DoWork(object sender, DoWorkEventArgs e)
        {
            List<string> autoCompleteItems = GetAutocompleteItems();
            if (autoCompleteItems == null) return;
            AutoCompleteStringCollection collection = new AutoCompleteStringCollection();
            collection.AddRange(GetAutocompleteItems().ToArray());
            e.Result = collection;
        }

        protected abstract List<string> GetAutocompleteItems();
    }

    internal delegate void SetAutocompleteSource(AutoCompleteStringCollection collection);
}

---

我为文本框编写了一个异步自动完成类：

using System;
using System.Windows.Forms;
using System.Collections.Generic;
using System.Text;
using System.ComponentModel;

namespace TextboxAutocomplete
{
    public abstract class AutoCompleteSource
    {
        private TextBox mTextBox;
        private AutoCompleteMode mAutoCompleteMode;

        public AutoCompleteSource(TextBox textbox) :
            this(textbox, AutoCompleteMode.Suggest) { }

        public AutoCompleteSource(TextBox textbox, AutoCompleteMode mode)
        {
            if (textbox == null)
                throw new ArgumentNullException("textbox");

            if (textbox.IsDisposed)
                throw new ArgumentException("textbox");

            mTextBox = textbox;
            mAutoCompleteMode = mode;

            mTextBox.AutoCompleteSource = System.Windows.Forms.AutoCompleteSource.None;

            BackgroundWorker autoCompleteLoader = new BackgroundWorker();
            autoCompleteLoader.DoWork += new DoWorkEventHandler(autoCompleteLoader_DoWork);
            autoCompleteLoader.RunWorkerCompleted += new RunWorkerCompletedEventHandler(autoCompleteLoader_RunWorkerCompleted);
            autoCompleteLoader.RunWorkerAsync();
        }

        void autoCompleteLoader_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            AutoCompleteStringCollection collection = e.Result as AutoCompleteStringCollection;
            if (collection == null) return;

            if (mTextBox.InvokeRequired)
            {
                mTextBox.Invoke(new SetAutocompleteSource(DoSetAutoCompleteSource), new object[] { collection });
            }
            else
            {
                DoSetAutoCompleteSource(collection);
            }
        }

        protected void DoSetAutoCompleteSource(AutoCompleteStringCollection collection)
        {
            if (mTextBox.IsDisposed) return;

            mTextBox.AutoCompleteMode = mAutoCompleteMode;
            mTextBox.AutoCompleteSource = System.Windows.Forms.AutoCompleteSource.CustomSource;
            mTextBox.AutoCompleteCustomSource = collection;
        }

        void autoCompleteLoader_DoWork(object sender, DoWorkEventArgs e)
        {
            List<string> autoCompleteItems = GetAutocompleteItems();
            if (autoCompleteItems == null) return;
            AutoCompleteStringCollection collection = new AutoCompleteStringCollection();
            collection.AddRange(GetAutocompleteItems().ToArray());
            e.Result = collection;
        }

        protected abstract List<string> GetAutocompleteItems();
    }

    internal delegate void SetAutocompleteSource(AutoCompleteStringCollection collection);
}

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但是，当文本更改时，自动完成应该异步进行。它是如何连接到text_changed事件的？这正是我想要的，但是当文本更改时，自动完成应该异步发生。它是如何连接到文本更改事件的？这正是我想要的

 ...
 TextBox myTextbox = new TextBox();
 MockAutoCompleteSource autoComplete =
      new MockAutoCompleteSource(myTextbox);
 ...