C# 从循环通过 winform 控件以编程方式获取 checkbox.checked 值
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Get checkbox.checked value programmatically from cycling through winform controls
提问by gnarlybracket
For my winforms program, I have an Options dialog box, and when it closes, I cycle throught all the Dialog Box control names (textboxes, checkboxes, etc.) and their values and store them in a database so I can read from it in my program. As you can see below, I can easily access the Textproperty from the Controlgroup, but there's no property to access the Checkedvalue of the textbox. Do I need to convert c, in that instance, to a checkbox first?
对于我的 winforms 程序，我有一个选项对话框，当它关闭时，我循环查看所有对话框控件名称（文本框、复选框等）及其值并将它们存储在数据库中，以便我可以从中读取我的程序。正如您在下面看到的，我可以轻松地Text从Control组中访问该属性，但没有可以访问Checked文本框值的属性。c在这种情况下，我是否需要先将转换为复选框？
conn.Open();
foreach (Control c in grp_InvOther.Controls)
{
string query = "INSERT INTO tbl_AppOptions (CONTROLNAME, VALUE) VALUES (@control, @value)";
command = new SQLiteCommand(query, conn);
command.Parameters.Add(new SQLiteParameter("control",c.Name.ToString()));
string controlVal = "";
if (c.GetType() == typeof(TextBox))
controlVal = c.Text;
else if (c.GetType() == typeof(CheckBox))
controlVal = c.Checked; ***no such property exists!!***
command.Parameters.Add(new SQLiteParameter("value", controlVal));
command.ExecuteNonQuery();
}
conn.Close();
If I need to convert cfirst, how do I go about doing that?
如果我需要先转换c，我该怎么做？
采纳答案by Mario Sannum
Yes, you need to convert it:
是的，你需要转换它：
else if (c.GetType() == typeof(CheckBox))
controlVal = ((CheckBox)c).Checked.ToString();
And you can make the check simpler to read:
您可以使支票更易于阅读：
else if (c is CheckBox)
controlVal = ((CheckBox)c).Checked.ToString();
回答by Alex
You can cast in place:
您可以就地投射：
controlVal = (CheckBox)c.Checked;
BTW: controlVal does not need to be a string, a boolean will do the job and save memory.
顺便说一句： controlVal 不需要是一个字符串，一个布尔值将完成这项工作并节省内存。
回答by Fahad Murtaza
try this:
尝试这个：
controlVal = Convert.ToString(c.Checked);
回答by No Idea For Name
robert's answer is good but let me give you a better one
罗伯特的回答很好，但让我给你一个更好的
TextBox currTB = c as TextBox;
if (currTB != null)
controlVal = c.Text;
else
{
CheckBox currCB = c as CheckBox;
if (currCB != null)
controlVal = currCB.Checked;
}
