wpf 如何将组合框项目放在列表中？
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How to put combobox Items in a list?
提问by Little Programmer
I added Items to a combobox using:
我使用以下方法将项目添加到组合框：
SqlDataReader sqlReader = sqlCmd.ExecuteReader();
while (sqlReader.Read())
{
string name = sqlReader.GetString(0);
combobox1.Items.Add(name);
}
sqlReader.Close();
conn.Close();
Now I want to put these value in a string list. Is that possible and how can I do that?
现在我想把这些值放在一个字符串列表中。这可能吗，我该怎么做？
回答by MANISH KUMAR CHOUDHARY
Simply you can do something like
简单地你可以做类似的事情
string[] items = new string[combobox1.Items.Count];
for(int i = 0; i < combobox1.Items.Count; i++)
{
items[i] = combobox1.Items[i].ToString();
}
Or if want to Create a string list directly from reader object than
或者，如果想直接从阅读器对象创建一个字符串列表而不是
var itemList=new List<string>();
SqlDataReader sqlReader = sqlCmd.ExecuteReader();
while (sqlReader.Read())
{
string name = sqlReader.GetString(0);
combobox1.Items.Add(name);
itemList.Add(name);
}
sqlReader.Close();
conn.Close();
}
Use of LINQ will make you job very easier
使用 LINQ 会让你的工作变得更轻松
var arr = combobox1.Items.Cast<Object>()
.Select(item => item.ToString()).ToArray();
回答by Brendon
private List<string> ComboBoxList = new List<string>();
Create this outside of the method you are currently in. This List will allow you to use it in any method within the class.
在您当前所在的方法之外创建它。此列表将允许您在类中的任何方法中使用它。
private List<string> ComboBoxList;
or Try this instead of the top piece of code. They both work.
或者试试这个而不是最上面的一段代码。他们都工作。
SqlDataReader sqlReader = sqlCmd.ExecuteReader();
while (sqlReader.Read())
{
string name = sqlReader.GetString(0);
combobox1.Items.Add(name);
comboBoxList.Add(name);
}
sqlReader.Close();
conn.Close();
}
Create a new list and add each name to the list.
创建一个新列表并将每个名称添加到列表中。
回答by ángel Ibá?ez
I'm sure there's a more elegant method, but this works
我确定有更优雅的方法，但这有效
List<string> values = this.ComKeyType.Items
.Cast<object>()
.Select(x => x.ToString().Split('=')[1].Replace(" }", "").Trim())
.ToList();
回答by Rahul Hendawe
You probably want this:
你可能想要这个：
List<String> cbList = new List<String>();
var lstItems= ComboBox1.Items.Cast<Object>()
.Select(item => item.ToString()).ToList();
cbList.Add(lstItems);
回答by mechanic
You would really need to separate concerns in your code to make it maintainable.
您确实需要在代码中分离关注点以使其可维护。
If you want to bind a list to combobox, you can do it in XAML:
如果要将列表绑定到组合框，可以在 XAML 中进行：
<ComboBox ItemsSource="{Binding MyList}" SelectedItem="{Binding CurrentItem}" />
You'd better make an ObservableCollection property in your view model:
你最好在你的视图模型中创建一个 ObservableCollection 属性：
public ObservableCollection<string> MyList {get; private set;}
and initialize it in your view model's constructor:
并在您的视图模型的构造函数中初始化它：
MyList = new ObservableCollection<string>(GetNames());
GetNames()here is the method where your SQL code is incapsulated:
GetNames()这是封装 SQL 代码的方法：
private List<string> GetNames() {
var myList = new List<string>();
SqlDataReader sqlReader = sqlCmd.ExecuteReader();
while (sqlReader.Read())
{
string name = sqlReader.GetString(0);
myList.Add(name);
}
sqlReader.Close();
conn.Close();
return myList;
}
