为了让这项工作更加有效,我一直都疯了。
我的代码中有几个类。我将尝试在下面发布相关代码并尽可能缩短
public class ServerSettings
{
private BindingList<Server> serverList = new BindingList<Server>();
public ServerSettings()
{
}
private void readSettings()
{
string list = "/Settings/Server";
XmlNodeList Xn = settings.SelectNodes(list);
foreach (XmlNode xNode in Xn)
{
Server tmpSrv = new Server();
for (int i=0; i<xNode.ChildNodes.Count; i++)
{
if(xNode.ChildNodes[i].Name == "Name")
tmpSrv.Name = xNode.ChildNodes[i].InnerText;
else if(xNode.ChildNodes[i].Name == "Host")
tmpSrv.Host = xNode.ChildNodes[i].InnerText;
else if(xNode.ChildNodes[i].Name == "Username")
tmpSrv.Username = xNode.ChildNodes[i].InnerText;
else if(xNode.ChildNodes[i].Name == "Password")
tmpSrv.Password = xNode.ChildNodes[i].InnerText;
}
tmpSrv.ID = xNode.Attributes["ID"].Value;
serverList.Add(tmpSrv);
}
}
public BindingList<Server> getServerList()
{
return serverList;
}
public void setServer(Server srv, bool isNew)
{
if(isNew)
{
serverList.Add(srv);
srvCount++;
}
else
{
string list = "/Settings/Server[@ID='"+srv.ID+"']";
XmlNodeList Xn = settings.SelectNodes(list);
if(Xn.Count == 1)
{
XmlNode srvNode = Xn[0];
for (int i=0; i<srvNode.ChildNodes.Count; i++)
{
if(srvNode.ChildNodes[i].Name == "Name")
srvNode.ChildNodes[i].InnerText = srv.Name;
else if(srvNode.ChildNodes[i].Name == "Host")
srvNode.ChildNodes[i].InnerText = srv.Host;
else if(srvNode.ChildNodes[i].Name == "Username")
srvNode.ChildNodes[i].InnerText = srv.Username;
else if(srvNode.ChildNodes[i].Name == "Password")
srvNode.ChildNodes[i].InnerText = srv.Password;
}
}
}
}
}
在另一个表单类中,我有以下函数,在程序启动时调用一次
public void populateServerListBox(ref BindingList<Server> srvList)
{
this.serverListBox.DisplayMember = "Name";
this.serverListBox.DataSource = srvList;
}
最后
public partial class NewServerForm : Form
{
private bool _isEdit = false;
private bool isCanceled = true;
private Server selSrv = null;
public NewServerForm()
{
InitializeComponent();
}
void NewServerFormOKBtClick(object sender, EventArgs e)
{
isCanceled = false;
this.Close();
}
void NewServerFormCancelBtClick(object sender, EventArgs e)
{
isCanceled = true;
this.Close();
}
public bool isEdit
{
get
{
return _isEdit;
}
set
{
_isEdit = value;
}
}
public void showForm(ref Server srv)
{
selSrv = srv;
isEdit = true;
this.newServerFormNameTb.Text = selSrv.Name;
this.newServerFormHostTb.Text = selSrv.Host;
this.newServerFormUsernameTb.Text = selSrv.Username;
this.newServerFormPwdTb.Text = selSrv.Password;
this.ShowDialog();
}
public void showForm()
{
selSrv = new Server();
this.ShowDialog();
}
void NewServerFormFormClosing(object sender, FormClosingEventArgs e)
{
if(isCanceled || selSrv == null)
this.Dispose();
else if(isEdit && selSrv != null)
{
selSrv.Name = this.newServerFormNameTb.Text;
selSrv.Host = this.newServerFormHostTb.Text;
selSrv.Username = this.newServerFormUsernameTb.Text;
selSrv.Password = this.newServerFormPwdTb.Text;
selSrv.BgwConfigPath = this.newServerFormBgwlocTb.Text;
isCanceled = true;
MainProgram.serverSettings.setServer(selSrv, false);
this.Dispose();
}
else if(selSrv != null)
{
selSrv.Name = this.newServerFormNameTb.Text;
selSrv.Host = this.newServerFormHostTb.Text;
selSrv.Username = this.newServerFormUsernameTb.Text;
selSrv.Password = this.newServerFormPwdTb.Text;
MainProgram.serverSettings.setServer(selSrv, true);
isCanceled = true;
this.Dispose();
}
}
}
我正在尝试为不同的服务器构建简单的用户设置菜单,用户可以在其中添加,删除或更改现有的服务器设置。在带有列表框的表单中,用户单击一个按钮,该按钮会显示另一个表单,其中包含一些文本框供用户填写,然后单击“确定”以执行更改。
这些更改反映在bindingList中的Items(新项目或现有项目的更新)中。添加新的服务器项或从bindingList中删除一个会立即反映在列表框中,但是对现有项的更改将拒绝更新列表框。关闭包含列表框的表单并再次打开它将显示更改,但是当在列表框中完成更改时,我无法立即使用它。
我试过在列表框上调用refresh(),在BindingList上调用resetBindings()以及其他几个。
我在这里错过了什么吗?
答案 0 :(得分:8)
一个脏修复和已知的列表框微软错误:我们每次都需要刷新框内容设置datasource = null,然后重新绑定它。
它没有更新的原因是因为列表中的对象没有改变,它只检查对象的引用而不是它们的内容。
<强> [编辑] 强>
正确的方法是在“Server”类上实现INotifyPropertyChanged
接口。让我给你一些参考资料。
http://msdn.microsoft.com/en-us/library/system.componentmodel.inotifypropertychanged(v=VS.80).aspx
http://www.gavaghan.org/blog/2007/07/17/use-inotifypropertychanged-with-bindinglist/
http://www.codeproject.com/KB/cs/BindBetterINotifyProperty.aspx