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Hi All,
My C# - VS2005 Application occasionally gives the NullReferenceException when the application is being debugged in Relase mode. It occurs when the program is left idle in debug mode for a long time around 30min.
Any idea why such an error could occur?
Please find the call-stack of the error.
System.Windows.Forms.dll!System.Windows.Forms.Control.WaitForWaitHandle(System.Threading.WaitHandle waitHandle = {System.Threading.ManualResetEvent}) + 0x18 bytes <br />
System.Windows.Forms.dll!System.Windows.Forms.Control.MarshaledInvoke(System.Windows.Forms.Control caller, System.Delegate method, object[] args, bool synchronous) + 0x36d bytes <br />
System.Windows.Forms.dll!System.Windows.Forms.Control.Invoke(System.Delegate method, object[] args) + 0x48 bytes <br />
System.Windows.Forms.dll!System.Windows.Forms.WindowsFormsSynchronizationContext.Send(System.Threading.SendOrPostCallback d, object state) + 0x61 bytes <br />
System.dll!Microsoft.Win32.SystemEvents.SystemEventInvokeInfo.Invoke(bool checkFinalization = true, object[] args = {Dimensions:[2]}) + 0x68 bytes <br />
System.dll!Microsoft.Win32.SystemEvents.RaiseEvent(bool checkFinalization = true, object key = {object}, object[] args = {Dimensions:[2]}) + 0x106 bytes <br />
System.dll!Microsoft.Win32.SystemEvents.OnUserPreferenceChanging(int msg, System.IntPtr wParam, System.IntPtr lParam) + 0x6f bytes <br />
System.dll!Microsoft.Win32.SystemEvents.WindowProc(System.IntPtr hWnd = 591970, int msg = 8218, System.IntPtr wParam = 47, System.IntPtr lParam = 2201016) + 0x288 bytes
Any help will be great.
Arti Gujare
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Can anyone tell me if there is a way in C# to do a reverse find?
I have an address that i am parsing say:
124 Modal Street SpringField MO 11222
I start from the back and get the zip and state cause that is more common.
From there, i would just like to grab the city by getting a start index of the space before "SpringField". Can i do that from reverse like this?
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You might want to consider using Regular Expressions to parse things like addresses
led mike
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Use the LastIndexOf method on the string. You can use it to search from the end of the string, or from a specific character index, towards the beginning of the string.
---
single minded; short sighted; long gone;
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You could use the Split method on the string. It would pass back an array of strings. Then you can look at the last value in the array for zipcode etc.
Ben
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hi.. i'm writing a prog to send and write data to a clock via a serial port. i hv some errors on the code.. can someone look at my code and help me solve the prob? this is the errors i got...
Error1: A namespace does not directly contain members such as fields or methods
namespace Proj
{
public partial class Form1 : Form
{
private string[] tx_data = new string[14];
private string[] rx_data = new string[10];
public int i;
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
}
private void label16_Click(object sender, EventArgs e)
{
}
private void label18_Click(object sender, EventArgs e)
{
}
private void button3_Click(object sender, EventArgs e)
{
}
private void textBox1_TextChanged(object sender, EventArgs e)
{
}
private void button1_Click(object sender, EventArgs e)
{
}
private void dataGridView2_CellContentClick(object sender, DataGridViewCellEventArgs e)
{
}
private void txtTxmID1_TextChanged(object sender, EventArgs e)
{
}
private void txtTxmID5_TextChanged(object sender, EventArgs e)
{
}
private void lblRx2_TextChanged(object sender, EventArgs e)
{
}
private void lblRx5_TextChanged(object sender, EventArgs e)
{
}
private void cmdRead_Click(object sender, EventArgs e)
{
//For i = 1 To 6
// lblRx(i).Caption = rx_data(i + 1)
//Next i
string OutString = null;
string Instring = null;
int y = 0;
open_port;
//If the port is opened...
if (Comm1.PortOpen)
{
//tx_data(0) = "R"
//tx_data(1) = "I"
//tx_data(2) = "D"
//For i = 0 To 2
// Comm1.Output = tx_data(i)
//Next i
OutString = "RID";
Comm1.Output = OutString;
}
}
public void writeID(string SysID, string SchID, string DeptID, string BlkID, string LevelID, string ClkID)
{
string OutString = null;
OutString = "";
tx_data[0] = "R";
tx_data[1] = "P";
tx_data[2] = "g";
tx_data[3] = cvtHexToDec(SysID);
tx_data[4] = cvtHexToDec(SchID);
tx_data[5] = cvtHexToDec(DeptID);
tx_data[6] = cvtHexToDec(BlkID);
tx_data[7] = cvtHexToDec(LevelID);
tx_data[8] = cvtHexToDec(ClkID);
System.DateTime mytime = DateTime.MinValue;
int HOU = 0;
int MIN = 0;
int SEC = 0;
mytime = Time; //obtain current system time
HOU = mytime.Hour; //obtain current system hour
MIN = mytime.Minute; //obtain current system minute
SEC = mytime.Second; //obtain current system seconds
tx_data[9] = cvtHexToDec(System.Convert.ToString(HOU));
tx_data[10] = cvtHexToDec(System.Convert.ToString(MIN));
tx_data[11] = cvtHexToDec(System.Convert.ToString(SEC));
tx_data[12] = cvtHexToDec("00");
for (i = 0; i <= 12; i++)
{
OutString = OutString + tx_data[i];
}
open_port;
//If the port is opened...
if (Comm1.PortOpen)
{
Comm1.Output = OutString;
Comm1.PortOpen = false;
}
}
public object cvtHexDec(string txtID)
{
string firstnum = null;
string secnum = null;
int f = 0;
int s = 0;
if (txtID.Length == 2)
{
firstnum = txtID.Substring(0, 1).ToUpper();
secnum = txtID.Substring(1, 1).ToUpper();
}
else
{
firstnum = "0";
secnum = txtID.Substring(0, 1).ToUpper();
}
for (i = 65; i <= 70; i++) // check for A - F (Hex format)
{
if (firstnum == (char)(i))
{
f = (i - 55) * 16;
break;
}
}
for (i = 48; i <= 57; i++) // check for 0 - 9 (Hex format)
{
if (firstnum == (char)(i))
{
f = (i - 48) * 16;
break;
}
}
for (i = 65; i <= 70; i++) // check for A - F (Hex format)
{
if (secnum == (char)(i))
{
s = i - 55;
break;
}
}
for (i = 48; i <= 57; i++) // check for 0 - 9 (Hex format)
{
if (secnum == (char)(i))
{
s = i - 48;
break;
}
}
f = f + s; //add the total of fisrtnum & secnum dec
cvtHexDec = (char)(f); //convert back to char
}
public object cvtHexToDec(string txtID)
{
string firstnum = null;
string secnum = null;
byte f = 0;
byte s = 0;
if (txtID.Length == 2)
{
firstnum = txtID.Substring(0, 1).ToUpper();
secnum = txtID.Substring(1, 1).ToUpper();
}
else
{
firstnum = "0";
secnum = txtID.Substring(0, 1).ToUpper();
}
if (System.Convert.ToInt32(firstnum[0]) >= 65)
{
f = System.Convert.ToInt32(firstnum[0]) - 55;
}
else
{
f = System.Convert.ToInt32(firstnum[0]) - 48;
}
f = f * 16;
if (System.Convert.ToInt32(secnum[0]) >= 65)
{
s = System.Convert.ToInt32(secnum[0]) - 55;
}
else
{
s = System.Convert.ToInt32(secnum[0]) - 48;
}
f = f + s; //add the total of fisrtnum & secnum dec
return (char)(f); //convert back to char
}
private void cmdWrite_Click(object sender, EventArgs e);
}
writeID(txtTxmID0.Text.ToUpper(),txtTxmID1.Text.ToUpper(),txtTxmID2.Text.ToUpper(), txtTxmID3.Text.ToUpper(), txtTxmID4.Text.ToUpper(),txtTxmID5.Text.ToUpper());
}
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it's a quite large amount of code: please note that the compiler reports the line number where error occurs (and also the IDE helps you to locate the error).
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
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Error1 is telling you that something is declared where it's not allowed to be. The first variables in your code
private string[] tx_data = new string[14];
private string[] rx_data = new string[10];
public int i;
need to be moved so that they're declared inside of your class Form1. This also generates Error2 and Error3, so fix the first one and you fix them all.
On an unrelated note, the arrays tx_data and rx_data are being indexed using parentheses - tx_data(0) = "R" - which is incorrect. They need to be indexed with brackets instead: tx_data[0] = "R"
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Hi,
Looking at the xml below, please let me know how to retrieve the data for the value elements.
Thanks
<fxspotrate code="EURUSD">
<values>
<value type="BID">1.3607
<value type="ASK">1.3608
<value type="MID">1.36075
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Please repost and check the Ignore HTML tags in the message so that the < > show up.
Thanks,
Ben
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<FXSpotRate code="EURUSD">
<values>
<value type="BID">1.3607</value>
<value type="ASK">1.3608</value>
<value type="MID">1.36075</value>
</values>
</FXSpotRate>
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Something like this should work:
XmlDocument xDoc = new XmlDocument();
xDoc.InnerXml = @"<FXSpotRate code='EURUSD'><values><value type='BID'>1.3607</value><value type='ASK'>1.3608</value><value type='MID'>1.36075</value></values></FXSpotRate>";
XmlNodeList nodes = xDoc.SelectNodes("/FXSpotRate/values/value");
foreach (XmlNode xn in nodes)
{
//access the node info in here
}
Hope that helps.
Ben
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Hi ,
I have two Applications , 1 being a Windows Service and the other one is a Windows Application . Both the Applications access an xml file which has to be modified under different scenarios .
I want to avoid concurrent updates /Reads on the xml file from both the application .
Tried using the ReadWriteLock for avoiding concurrent access on the file ,but it doesn't seem to work .
Kindly suggest how this can be achieved .
Thanks in Advance
Girija
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CORRECTION:
Open the file as FileShare.None[^] (one of the sharing options) - that way nothing else will be able to open the file.
e.g.
FileStream stream = new FileStream("C:\MyFile.txt", FileMode.Open, FileAccess.ReadWrite, FileShare.None);
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AFAIK the ReaderWriterLock is local to a process. You will have to use a named Mutex, that has system scope and thus can be shared between processes.
Regards,
Tim
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Hello everyone,
I have a listview in my Windows Application which I wish to add some functionality to it's item. Since I wish the contextMenu to pop up only when an item is selected rather than anywhere in the area of ListView, I am using the following code:
private void listview1_MouseDown(object sender, MouseEventArgs e)<br />
{<br />
ListViewHitTestInfo info = listView1.HitTest(e.X, e.Y);<br />
<br />
if (info.Item != null)<br />
{<br />
if (e.Button == MouseButtons.Left)<br />
{<br />
if (contextMenuStripListView1 != null)<br />
{<br />
contextMenuStripListView1.Show(listView1, new System.Drawing.Point((e.X + 15), (e.Y + 10)));<br />
}<br />
}<br />
}<br />
}
everything works fine if I use the LEFT mouse click to pop up the contextMenu as shown in above code. The problem appears once I change the left mouse click to RIGHT mouse click. Since I have another contextMenu which is assigned into the entire Form. I get the local contextMenu (The desired Menu) pop up first, then once I release the mouse I get the second ContextMenu (The undesired Menu) which is assigned to the form pops up. Is there anyway to disable the undesired contextMenu just in the area of listview?
OR should I use a different approach?
Thank you very much for your help and have a great day.
Khoramdin
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Khoramdin wrote: Is there anyway to disable the undesired contextMenu just in the area of listview?
Since you are clearly controlling when-if the context menu shows for the listview I would imagine the same can be done for the form. Do you have a more specific question? 
led mike
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I have a MyDataSet : DataSet class which contains 3 talbes and 2 data relations. This is set to a custom datagrid which can expand to show something like Users -> tickets for user -> details of ticket. I'm sure this is entirely simple, but how do I sort while keeping my dataset as the datasource? When I google they always discard the dataset and do something like:
MyDataSet ds = (MyDataSet) _dgUsers.DataSource;<br />
DataView dv = ds.Tables[0].DefaultView;<br />
dv.Sort = "something ASC";<br />
_dgUsers.DataSource = dv;<br />
_dgUsers.DataBind();
This is useless as I've just lost my dataset. I tried modifying the view of the table inside the dataset but it just gets ignored (although it remains set when I sort again):
MyDataSet ds = (MyDataSet) _dgUsers.DataSource;<br />
DataView dv = ds.Tables[0].DefaultView;<br />
dv.Sort = "something ASC";<br />
_dgUsers.DataSource = ds;<br />
_dgUsers.DataBind();
How should it be done? When I clone the DataSet it seems to work. Why is that?
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Perhaps you should try:
ds.Tables[0].DefaultView.Sort = "something ASC";
_dgUsers.DataSource = ds;
_dgUsers.DataBind();
Ben
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That's what I did in the second code block. Doesn't matter if you touch the dg.DataSource or set it to a local variable as its a pointer to the same dataset object. Like I said, I would see "something ASC" set the next time I would sort. The code was there to toggle so clicking it you could see it going from ASC to DESC and back again. However, it did nothing. For some reason we needed to clone the dataset and set it back to the datagrid.
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Hi
My UserControl does not look properly, I would like very much someone to help me adjusting it, it only paints well when it is a perfect rectangle otherwise it does not! I would like a panel with this look but when resized displays perfect as well
Here is the code:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Text;
using System.Windows.Forms;
using System.Drawing.Drawing2D;
using System.Drawing.Extended;
namespace Teste17
{
public partial class UserControl5 : UserControl
{
public UserControl5()
{
InitializeComponent();
}
private void UserControl5_Paint(object sender, PaintEventArgs e)
{
LinearGradientBrush linearGradientBrush = new LinearGradientBrush(this.ClientRectangle, Color.Black, Color.Black, 45, false);
ColorBlend colorBlend = new ColorBlend();
colorBlend.Positions = new float[4];
colorBlend.Positions[0] = 0.00f;
colorBlend.Positions[1] = 0.49f;
colorBlend.Positions[2] = 0.51f;
colorBlend.Positions[3] = 1.00f;
colorBlend.Colors = new Color[4];
colorBlend.Colors[0] = Color.FromKnownColor(KnownColor.Window);
colorBlend.Colors[1] = Color.FromKnownColor(KnownColor.Window);
colorBlend.Colors[2] = Color.FromKnownColor(KnownColor.ControlDark);
colorBlend.Colors[3] = Color.FromKnownColor(KnownColor.ControlDark);
linearGradientBrush.InterpolationColors = colorBlend;
e.Graphics.SmoothingMode = SmoothingMode.HighQuality;
ExtendedGraphics extendedGraphics = new ExtendedGraphics(e.Graphics);
Pen pen = new Pen(linearGradientBrush);
extendedGraphics.DrawRoundRectangle(pen, 0, 0, this.Width - 1, this.Height - 1, 5);
}
}
}
The code of using System.Drawing.Extended; is from a friend here in codeproject which name I cannot remenber at the moment...
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I suggest you abandon System.Drawing.Extended; it has some problems that are fundamental and honestly it's not that flexible.
If you're willing to download a larger framework, the most beautiful extended Panel I have ever seen comes from the Ascend.Net project:
http://www.codeplex.com/ASCENDNET[^]
Absolutely beautiful set of controls.
------------
Cheers,
Patrick
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I have a form application that monitors a directory, reads new files and sends a query off to a web service. That is all that it does. When i build this app on my XP Pro laptop and run the executeable it works fine. If i take that same .exe and drop it on the XP server. When i double click to start it, i immediately get an error.
Common Language Runtime Debugger Services.
Appplication has generated an exception that could not be handled.
Process ID = oxa88(2696) Thread id = 0xaac(2732)
I know that that error message does not say much but i was wondering if anyone had any ideas for me to try???
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You should try creating a setup kit and install it on the server. Copying the exe file will not help, unless you have the framework installed on the server and all the dependencies with the exe are copied in the required folders on the server(which is tedious).
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Hi,
I am using Visual Studio 2005 for my projects.
I am getting empty Properties Window. and ToolBox Window.
So, I am not able to create any controls and change their Properties.
But i am able to run the application.
Please Tell me What is the Problem. I am new to Microsoft .Net.
With Thanks,
Sakthi.
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