在Pocket PC的编程应用程序上使用ListBox [英] using ListBox on programming application for pocket pc
本文介绍了在Pocket PC的编程应用程序上使用ListBox的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
大家好！
我的应用程序有问题.我从PC发送了一个string []到袖珍PC，然后在ListBox上显示了该string [].它表现得很完美.然后，我继续发送另一个string []到Pocket PC.我尝试使用
Hi all!
I have some problem with my application. I sent a string[] from PC to pocket pc and then show that string[] on a ListBox. It showed perfectly. Then I continued to send another string[] to pocket pc. I try to use
listBox.Items.Clear()清除旧数据并显示新数据.但这没有用.我该怎么解决?
listBox.Items.Clear()在净CF中不起作用吗?
非常感谢！
是的！我将发布我的代码.似乎很长.我使用套接字在PC和PPC之间发送数据.这是PPC上的客户端:
to clear old data and show new data. But it didn''t work. How can I solve that?
Didn''t listBox.Items.Clear() work in net CF?
Thank you very much!
Yes! I will post my code. It seem quite long. I used socket to send data between PC and PPC.This is client on PPC:
<pre lang="msil">public partial class Form2 : Form
{
public Socket client_PCRemote;
//IPEndPoint iep;
EndPoint remote;
public Form1 frm1;
//private int serverPort = 2011;
Thread receive = null;
delegate void capnhatCT(string value);
capnhatCT controlSet;
public string path = null;
public Form2()
{
InitializeComponent();
}
private void Form2_Load(object sender, EventArgs e)
{
remote = (EndPoint)client_PCRemote.RemoteEndPoint;
receive = new Thread(new ThreadStart(receiveDt));
receive.Start();
}
public void receiveDt()
{
while (true)
{
try
{
//MessageBox.Show("co du lieu nhan");
byte[] data = new byte[1024 * 32];
int recv = client_PCRemote.ReceiveFrom(data, ref remote);
string response = Encoding.ASCII.GetString(data, 0, recv);
//response = response.TrimStart(tmp.ToCharArray());
string tmp;
if(response.Contains("disk"))
{
tmp = "disk";
response = response.TrimStart(tmp.ToCharArray());
string[] entry = response.Split(''\\'');
foreach(string entry1 in entry)
{
controlSet = new capnhatCT(UpdateCB);
if(this.comboBox1.InvokeRequired)
{
this.Invoke(controlSet, new object[] {entry1});
}
}
}
if (response.Contains("folder"))
{
ShowFolder(response);
}
if (response.Contains("subFolder"))
{
ShowSubFolder(response);
}
}
catch(Exception ex)
{
}
}
}
private void ShowFolder(string a)
{
listBox1.Items.Clear();
//I can''t show data to listbox if I use this
listBox2.Items.Clear();
//I can''t show data to listbox if I use this
string idenString = "folder";
a = a.TrimStart(idenString.ToCharArray());
string[] tempalate = a.Split(''^'');
string folder = tempalate[0];
string file = tempalate[1];
string[] fld_entry = folder.Split(''\\'');
string[] file_entry = file.Split(''\\'');
controlSet = new capnhatCT(UpdateLB);
for (int i = 0; i < fld_entry.Length; i++)
{
if (this.listBox1.InvokeRequired)
{
this.Invoke(controlSet,new object[] {fld_entry[i]});
}
}
controlSet = new capnhatCT(UpdateLBFile);
for (int i = 0; i < file_entry.Length; i++)
{
if (this.listBox2.InvokeRequired)
{
this.Invoke(controlSet, new object[] { file_entry[i] });
}
}
}
private void ShowSubFolder(string a)
{
listBox1.Items.Clear();
//it is the same
listBox2.Items.Clear();
//it is the same
string idenString = "subFolder";
a = a.TrimStart(idenString.ToCharArray());
string[] tempalate = a.Split(''^'');
string folder = tempalate[0];
string file = tempalate[1];
string[] fld_entry = folder.Split(''\\'');
string[] file_entry = file.Split(''\\'');
controlSet = new capnhatCT(UpdateLB);
for (int i = 0; i < fld_entry.Length; i++)
{
if (this.listBox1.InvokeRequired)
{
this.Invoke(controlSet, new object[] { fld_entry[i] });
}
}
controlSet = new capnhatCT(UpdateLBFile);
for (int i = 0; i < file_entry.Length; i++)
{
if (this.listBox2.InvokeRequired)
{
this.Invoke(controlSet, new object[] { file_entry[i] });
}
}
}
public void UpdateCB(string value)
{
comboBox1.Items.Add(value);
}
public void UpdateLB(string value)
{
listBox1.Items.Add(value);
}
public void UpdateLBFile(string value)
{
listBox2.Items.Add(value);
}
public void sendRequest(string request)
{
try
{
byte[] data = new byte[1024 * 32];
data = Encoding.ASCII.GetBytes(request);
client_PCRemote.SendTo(data, remote);
}
catch (Exception ex) { }
}
private void button1_Click(object sender, EventArgs e)
{
sendRequest("GetDisk");
}
private void menuItem2_Click(object sender, EventArgs e)
{
if (client_PCRemote != null)
{
client_PCRemote.Close();
}
if (receive != null)
{
receive.Abort();
}
frm1.Close();
this.Close();
}
private void button2_Click(object sender, EventArgs e)
{
string folder = comboBox1.SelectedItem.ToString();
string tamp = "GetFolder" + folder;
sendRequest(tamp);
}
private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
}
private void menuItem3_Click(object sender, EventArgs e)
{
string name = listBox1.SelectedItem.ToString();
string tmp_path = comboBox1.Text + "\\" + name;
path = tmp_path;
textBox1.Text = tmp_path;
string send_string = "GetSubFolder" + tmp_path;
sendRequest(send_string);
}
private void menuItem4_Click(object sender, EventArgs e)
{
string name = listBox2.SelectedItem.ToString();
string temp = comboBox1.Text + "\\" + name;
string send_string = "OpenFile" + temp;
sendRequest(send_string);
}
}
推荐答案
很难说不看代码，但是我怀疑您已经创建了ListBox的new实例，而不是清除现有实例.
如果不是这种情况，那么我们将需要查看相关的代码片段.
是的，我在上面发布了我的代码.谢谢".
这样更清楚了！
答案在您的代码中:
Difficult to say without seeing your code, but I suspect that you have created anewinstance of your ListBox rather than clearing the existing one.
If this is not the case, then we would need to see a relevant code fragment.
"Yes, I posted my code above. Thank you"
That makes it clearer!
The answer is in your code:
private void ShowFolder(string a)
{
listBox1.Items.Clear();
//I can''t show data to listbox if I use this
listBox2.Items.Clear();
//I can''t show data to listbox if I use this
string idenString = "folder";
a = a.TrimStart(idenString.ToCharArray());
string[] tempalate = a.Split(''^'');
string folder = tempalate[0];
string file = tempalate[1];
string[] fld_entry = folder.Split(''\\'');
string[] file_entry = file.Split(''\\'');
controlSet = new capnhatCT(UpdateLB);
for (int i = 0; i < fld_entry.Length; i++)
{
if (this.listBox1.InvokeRequired)
{
this.Invoke(controlSet,new object[] {fld_entry[i]});
}
}
controlSet = new capnhatCT(UpdateLBFile);
for (int i = 0; i < file_entry.Length; i++)
{
if (this.listBox2.InvokeRequired)
{
this.Invoke(controlSet, new object[] { file_entry[i] });
}
}
}
如果需要调用以将其添加到列表框，还需要调用以将其清除...
If you need an Invoke to add things to the ListBox, you will also need an Invoke to clear them out...
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