Question

我有一个要求，在自动填充文本框中，当我们选择将在文本框中加载的建议时再次输入时，新选择应加载到同一文本框中（带有“，”或空格）而不是空旧的。有没有可能这样做。这是我的一般自动完成我在表单加载中调用它。

        if (objMaster == null) objMaster = new MasterAsariReturn();
        dt = new DataTable();
        dt = objMaster.GetNameData();
        if (dt.Rows.Count > 0)
        {
            for (int i = 0; i < dt.Rows.Count; i++)
            {
                nameCollection.Add(dt.Rows[i][0].ToString());
            }

            txtProductSpec.AutoCompleteMode = AutoCompleteMode.Suggest;
            txtProductSpec.AutoCompleteSource = AutoCompleteSource.CustomSource;
            txtProductSpec.AutoCompleteCustomSource = nameCollection;
        }

Answer 1

我不确定这是不是你想要的，但我还是去了。我的解决方案是每次将新项目添加到列表时不断更新自动完成列表。

在表单构造函数或表单加载事件中：

public Form1()
{
    InitializeComponent();

    FullAutoCompleteSelection.Add("Item1");
    FullAutoCompleteSelection.Add("Item2");
    FullAutoCompleteSelection.Add("Item3");
    FullAutoCompleteSelection.Add("Item4");
    FullAutoCompleteSelection.Add("Item5");
    FullAutoCompleteSelection.Add("Item6");
    FullAutoCompleteSelection.Add("Item7");
    FullAutoCompleteSelection.Add("Item8");
    FullAutoCompleteSelection.Add("Item9");

    autoCompleteTestBox.AutoCompleteMode = AutoCompleteMode.Suggest;
    autoCompleteTestBox.AutoCompleteSource = AutoCompleteSource.CustomSource;
    UpdateAutoCompleteSource();
}

然后我有以下类（表单）私有成员：

private List<string> FullAutoCompleteSelection = new List<string>();
private AutoCompleteStringCollection CurrentAutoCompleteSelection = new AutoCompleteStringCollection();

我还在文本框的TextChanged事件中进行测试，看看是否需要更新自动完成列表：

private void autoCompleteTestBox_TextChanged(object sender, EventArgs e)
{
    if(CurrentAutoCompleteSelection.Count == 0)
    {
        UpdateAutoCompleteSource();
        return;
    }

    if (CurrentAutoCompleteSelection.Contains(autoCompleteTestBox.Text))
    {
        UpdateAutoCompleteSource();
        return;
    }

    string[] textItems = autoCompleteTestBox.Text.Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries);
    string[] checkItems = CurrentAutoCompleteSelection[0].Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries);

    if (textItems.Length < checkItems.Length - 1)
    {
        UpdateAutoCompleteSource();
        return;
    }

    for (int i = 0; i < checkItems.Length - 1; i++)
    {
        if (textItems[i].Trim() != checkItems[i].Trim())
        {
            UpdateAutoCompleteSource();
            return;
        }
    }
}

最后我有一个UpdateAutoCompleteSource方法：

private void UpdateAutoCompleteSource()
{
    string[] textItems = autoCompleteTestBox.Text.Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries);
    List<string> preSelectedItems = new List<string>();
    foreach (string item in textItems)
    {
        if (FullAutoCompleteSelection.Contains(item.Trim())) { preSelectedItems.Add(item.Trim()); }
    }

    List<string> autoCompleteList = FullAutoCompleteSelection.ToList();
    StringBuilder preString = new StringBuilder();
    foreach (string selectedItem in preSelectedItems)
    {
        if (autoCompleteList.Contains(selectedItem)) { autoCompleteList.Remove(selectedItem); }
        preString.Append(selectedItem + ", ");
    }

    CurrentAutoCompleteSelection = new AutoCompleteStringCollection();

    foreach (string item in autoCompleteList)
    {
        CurrentAutoCompleteSelection.Add(preString + item);
    }
    autoCompleteTestBox.AutoCompleteCustomSource = CurrentAutoCompleteSelection;
}

自动完成TextBox数据不应替换旧的

1 个答案: