首页 \ 问答 \ 在WPF Threestate Checkbox中捕获不确定状态(Capturing indeterminate state in WPF Threestate Checkbox)

在WPF Threestate Checkbox中捕获不确定状态(Capturing indeterminate state in WPF Threestate Checkbox)

 所以，我在WPF应用程序中有一个简单的三态复选框：  
<CheckBox Checked="CheckBox_Checked"
          Unchecked="CheckBox_Checked"
          IsThreeState="True" />
 
 现在，我希望此复选框在其状态发生变化时执行某些操作，这就是为什么我将Checked和Unchecked事件设置为视图中的相同方法。 由于这只是一个非常简单的例子，这就是我在该方法中所做的一切：  
    private void CheckBox_Checked(object sender, RoutedEventArgs e)
    {
        MessageBox.Show("Test");
    }
 
 现在的问题是，当选中或取消选中复选框时，这是有效的，当其值更改为不确定状态时，没有任何反应。 很明显，我正在为Checked和Unchecked设置事件，但缺少一些不确定状态的事件。  
 在设置不确定状态时，我需要使用什么事件才能采取措施？ 

So, I have a simple threestate checkbox in a WPF application: 
<CheckBox Checked="CheckBox_Checked"
          Unchecked="CheckBox_Checked"
          IsThreeState="True" />
 
Now, I want this checkbox to do something whenever its state is changed, which is why I'm setting the Checked and Unchecked events to the same method in the view. Since this is just a very simple example, this is all I'm doing in that method: 
    private void CheckBox_Checked(object sender, RoutedEventArgs e)
    {
        MessageBox.Show("Test");
    }
 
Now the problem is that while this works when the checkbox is checked or unchecked, nothing happens when its value is changed to the indeterminate state. It's clear that I'm setting events for Checked and Unchecked but missing some event for the indeterminate state. 
What event do I need to use in order to take action when the indeterminate state is set?

原文：https://stackoverflow.com/questions/23213775

更新时间：2022-07-10 08:07

最满意答案

 如果要检索数组中的信息（或任何可以遍历字符串的结构），可以创建如下方法：  
public String[] getDBNames(){
    String[] result;
    try {
        StringBuilder sb = new StringBuilder();
        sb.append("SELECT name FROM sqlite_master "); 
        sb.append("WHERE type IN ('table','view') AND name NOT LIKE 'sqlite_%' ");
        sb.append("UNION ALL ");
        sb.append("SELECT name FROM sqlite_temp_master "); 
        sb.append("WHERE type IN ('table','view') ");
        sb.append("ORDER BY 1");

        Cursor c = _db.rawQuery(sb.toString(), null);
        c.moveToFirst();

        result = new String[c.getCount()];
        int i = 0;
        while (c.moveToNext()) {
            result[i]= c.getString(c.getColumnIndex("name"));
            i++;
        }
        c.close();
    }
    catch(SQLiteException e){
        Log.e("OOPS", e);
    }
    return result;
}

If you want to retrieve the info in an array (or any structure which you can iterate through strings), you can make a method like: 
public String[] getDBNames(){
    String[] result;
    try {
        StringBuilder sb = new StringBuilder();
        sb.append("SELECT name FROM sqlite_master "); 
        sb.append("WHERE type IN ('table','view') AND name NOT LIKE 'sqlite_%' ");
        sb.append("UNION ALL ");
        sb.append("SELECT name FROM sqlite_temp_master "); 
        sb.append("WHERE type IN ('table','view') ");
        sb.append("ORDER BY 1");

        Cursor c = _db.rawQuery(sb.toString(), null);
        c.moveToFirst();

        result = new String[c.getCount()];
        int i = 0;
        while (c.moveToNext()) {
            result[i]= c.getString(c.getColumnIndex("name"));
            i++;
        }
        c.close();
    }
    catch(SQLiteException e){
        Log.e("OOPS", e);
    }
    return result;
}

在WPF Threestate Checkbox中捕获不确定状态(Capturing indeterminate state in WPF Threestate Checkbox)

最满意答案

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