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I have a dictionary where the key is a DateTime. I need to find the 2 entries in the dictionary that are closest to a given datetime.
So, I have
Dictionary<DateTime, double> columnInfos = new Dictionary<DateTime, double>();
foreach (var activity in activities)
{
DateTime activityDate = activity.ActivityDateTime;
}
I was going to loop through the dictionary, but is that really the best way?> Anyone have a better solution?
Thanks
If it's not broken, fix it until it is
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Coder (Hired) wrote: I was going to loop through the dictionary, but is that really the best way?
The best way depends on your requirements. If there can be a lot of DateTimes and lookup is more frequent than insertion/deletion then a SortedList<TKey, TValue>[^] might provide better performance. Though if you also need lookup by an exact DateTime then you would have to create a custom collection class where you combine a Dictionary with a SortedList to get the best of both (or maybe you can find an existing implementation of that).
If the brain were so simple we could understand it, we would be so simple we couldn't. — Lyall Watson
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Hello,
I have a performance problem with my application accessed on an active PowerPoint presentation (2010 version). Datas should readout of a datagrid and automatically entered to a PowerPoint slide which has to be created. Each entry of the DataGrid is written in a separate text box. It is this process that takes a long time. Does anyone knows technology / solution that can make the program much more quicker. Program code is written in C #.
List<Microsoft.Office.Interop.PowerPoint.Shape> ResponsibleTxtbox= new List<Microsoft.Office.Interop.PowerPoint.Shape>();
ResponsibleTxtbox.Add(slide.Shapes.AddTextbox(MsoTextOrientation.msoTextOrientationHorizontal, posLeft, posTop, 0, 0));
ResponsibleTxtbox[j].TextFrame2.WordWrap = MsoTriState.msoFalse;
ResponsibleTxtbox[j].TextFrame2.TextRange.Font.Size = mFontSize;
ResponsibleTxtbox[j].TextFrame2.TextRange.Font.Name = mFontName;
ResponsibleTxtbox[j].Tags.Add("TxtBoxType", "RespTxtBox" + j.ToString());
ResponsibleTxtbox[j].TextFrame2.TextRange.Text = responsiblesNames[j];
Thx in advanced
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The problem is that you're using Office COM Interop to generate the PowerPoint slides. Office Interop is notoriously slow and there's no way to speed it up.
If you're using Office 2007 or higher, you're only other choice is to generate the PowerPoint file directly using the OpenXML SDK[^]. It goes a LOT faster but the learning curve to use the SDK is pretty steep.
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Hello,
I would like to know if you can also edit open presentations with OpenXml? I have read it would not go. Do you know more about it since?
greeting
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If by "edit open presentations" you're talking about using OpenXML to make changes to a presentation that is currently open in PowerPoint and being view and seeing those changes as your code makes them, no.
The OpenXML SDK will only work with files on disk and NOT opened in PowerPoint.
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what can be a possibility to do that? Is there another xml stuff
I like to create new slides in an existing presentation which are filed with textboxes with different data. Like create a formular with c', insert different datas and create new slides out of it. All in a opend presentation
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Member 11775354 wrote: what can be a possibility to do that?
If this is the case, how you're doing it right now is your ONLY option and there is no way to speed it up.
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I know, that there must be a possibility not to usee the com interface, I have seen it, but do not know, how they do it
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If there is, I've never seen nor heard of it.
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have you guys who a very very familar with that stuff to check?
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dataaccesslayer
public SqlDataReader reader(string query)
{
try
{
con1.Open();
cmd = new SqlCommand(query, con1);
dr = cmd.ExecuteReader(System.Data.CommandBehavior.CloseConnection);
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}
finally
{
con1.Close();
}
return dr;
}
logical layer
public SqlDataReader Product_Gridclick(string id)
{
query = "select pid,pname,pmodel,pprice,sprice,discount,pdescription from product_table where pid=" + "'" + id + "'";
return da.reader(query);
}
presentation layer
string s = dataGridView1.Rows[e.RowIndex].Cells[0].Value.ToString();
SqlDataReader dr;
dr = llayer.Product_Gridclick(s);
if (dr.HasRows)
{
while (dr.Read())
{
txtproductid.ReadOnly = false;
txtproductid.Text = dr[0].ToString();
txtproname.Text = dr[1].ToString();
txtpromodel.Text = dr[2].ToString();
txtpurprice.Text = dr[3].ToString();
txtsaleprice.Text = dr[4].ToString();
txtdiscount.Text = dr[5].ToString();
rchdescription.Text = dr[6].ToString();
}
}
Gnanavel Sekar
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The finally in reader closes the connection. This happens before this method returns, so you are opening and closing the reader before you attempt to iterate over the reader.
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Suggestions:
- Create all Sql***-objects only locally (in methods), don't have variables for them as class members. Pass them as arguments to other methods if needed.
- Use all disposable Sql***-objects in using-blocks.
- Don't use Sql***-objects anywhere but in your DAL. Use DataTables/DataSets or POCOs to transport the data between your layers.
- Use SqlParameters instead of concatenating your query strings with values.
(By Sql***-objects I mean SqlConnection, SqlCommand, SqlDataReader etc.)
If the brain were so simple we could understand it, we would be so simple we couldn't. — Lyall Watson
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Sascha is right on all his points:
Your Data layer should be the only one which even knows of the existence of SQL your Business Layer (that you called the Logic Layer) should have no idea about SQL or DataAdapters - that way if you need to change from SQL Server to Access, or MySql or even a text file, the changes are localised to the Data access layer and don't impact any other area.
SQL objects are scarce resources, and you need to ensure that they are Disposed correctly. a using block is the best way to do this as it removes the variable whenever it goes out of scope. You can't return a DataReader from your reader code because the connection has been closed - and a DataReader needs the connection open until you have finished reading the records. Consider using a DataTable instead.
Do not concatenate strings to build a SQL command. It leaves you wide open to accidental or deliberate SQL Injection attack which can destroy your entire database. Use Parametrized queries instead.
Your business layer should probably be converting DataTable objects into collections of logical class object instances so that the BL can work with "sensible" objects instead of having to rely on the order of columns in a datatable (or worse a datareader as in your code). Certainly, your presentation layer should be working with "abstract objects" instead of anything like the actual raw data.
Setting the value of a textbox inside a loop will only give you the last row in the datareader - so if you are only getting a single row, use
if (dr.Read())
instead of
while (dr.Read()) It's a lot more obvious what you intended to happen. In this case, I'd want to check that there was only one such item - and log or report a problem if there were more or less.
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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Hello,
i need to build an Audiometric chart like this in c# .net 4
Audiometric chart
x values are: 125, 500, 1000, 2000, 4000, 8000
Consider that the series can have intermediate values, example 750, 3000, 6000.
i tried to use Datavisualization library, i suppose that values are logarithmic but I could not find the correct values.
here's the code
public MemoryStream DrawChart(double baseValue)
{
Chart chart = new Chart
{
Palette = ChartColorPalette.EarthTones,
Width = 1200,
Height = 800,
ForeColor = Color.Black,
BackColor = Color.White,
BorderlineDashStyle = ChartDashStyle.Solid,
BackSecondaryColor = Color.White,
BackGradientStyle = GradientStyle.None,
BorderWidth = 0
};
Series series = new Series("Right")
{
Color = Color.Red,
LabelForeColor = Color.Black,
ChartType = SeriesChartType.Line,
IsValueShownAsLabel = false,
XValueType = ChartValueType.Int32,
YValueType = ChartValueType.Int32,
MarkerStyle = MarkerStyle.None,
XAxisType = AxisType.Primary,
YAxisType = AxisType.Primary,
};
series.BorderWidth = 6;
series.SmartLabelStyle.Enabled = true;
series.Points.AddXY(125, 0);
series.Points.AddXY(250, 0);
series.Points.AddXY(500, 10);
series.Points.AddXY(1000, 120);
series.Points.AddXY(2000, 10);
series.Points.AddXY(3000, 0);
series.Points.AddXY(4000, 10);
series.Points.AddXY(6000, 10);
series.Points.AddXY(8000, 20);
chart.Series.Add(series);
ChartArea area = new ChartArea("Default")
{
BorderDashStyle = ChartDashStyle.Solid,
BackSecondaryColor = Color.White,
ShadowColor = Color.Transparent,
BackGradientStyle = GradientStyle.TopBottom,
BackColor = Color.Transparent,
};
area.AxisY.Minimum = -10;
area.AxisY.Maximum = 120;
area.AxisY.IsReversed = true;
area.AxisY.Interval = 10;
area.AxisX.IsLogarithmic = true;
area.AxisX.IntervalType = DateTimeIntervalType.Number;
area.AxisX.IntervalOffset = 0;
area.AxisX.IntervalOffsetType = DateTimeIntervalType.Auto;
area.AxisX.LogarithmBase = baseValue;
Title titleObj = new Title
{
ForeColor = Color.Black,
Text = "Audiometry",
};
if (area.AxisX.IsLogarithmic)
{
titleObj.Text += " logarithmic base " + area.AxisX.LogarithmBase;
}
chart.ChartAreas.Add(area);
chart.Titles.Add(titleObj);
chart.AntiAliasing = AntiAliasingStyles.All;
chart.TextAntiAliasingQuality = TextAntiAliasingQuality.Normal;
MemoryStream stream = new MemoryStream();
chart.SaveImage(stream, ChartImageFormat.Png);
stream.Seek(0, SeekOrigin.Begin);
return stream;
}
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Hello ,I want to generate crystal report to generate invoice using two tables CustomerOrder and OrderDetails..please help on how to handle multiple tables in crystal report
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you could use a stored procedure that joins multiple tables
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I am fairly new to programming and am maintaining a legacy web application.
Need to access a checkbox value and send it via email built in the same aspx page using C# code.
Here is the code. Any help on this will be much appreciated.
<pre lang="c#">
emailBody +="<tr>";
emailBody +="<td align='right' width='10%'><FONT face='Verdana' size='1'> Do you have any active MTY billing?: </FONT></td>";
emailBody +="<td width='20%'><FONT face='Verdana' size='2'> " + chkValue + "</FONT></td>";
emailBody +="</tr>";
<td colspan="4">
<input type="checkbox" name="Yes" id="chkYes" value="" onclick="alert('Do something');"/><B><FONT size="1" face="Verdana"> Yes </FONT></B>
<input type="checkbox" name="No" id="chkNo" value=""/> <B><FONT size="1" face="Verdana"> No</FONT></B>
</td>
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I think you should be using radio buttons instead of check boxes because checkbox is for multiple options. Anyways since you are using html controls in page I suggest you use jQuery code to update a hidden field value and read the same from C# code.
In your html code near checkboxes/radiobuttons add this
now in your javascript write the following code function which is called on checkbox checked event.
JavaScript/jQuery
==============================================================
function CaptureAndUpdate(val)
{
if(val.checked==true)
$('.hdn_checkBoxResult').val(true);
else
$('.hdn_checkBoxResult').val(false);
}
your html checkbox becomes
==========================================================
Rajesh K
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Thanks for the response..
I also have few other hidden inputs in the same page and they work fine.
As per your suggestion:
1) Added radio buttons instead of checkboxes.
2) Added hidden input field hdn_checkBoxResult.
3) Called a function to check if the value of radio button is true, if so, then assign value to hdn_checkBoxResult.
4) Appended hdn_checkBoxResult.Value in the email.
Is there anything else I am missing?
The email still doesn't show the selected radio button value.
Here is my code:
..............................................................................................
<td colspan="4">
<input type="radio" name="rdoCheck" id="rdoYes" value="" onclick ="theChecker(val)" />
<b><font size="1" face="Verdana">Yes </font></b>
<input type="radio" name="rdoCheck" id="rdoNo" value="" />
<b><font size="1" face="Verdana">No</font></b>
</td>
Have declared this hidden input field outside the table.
<input type="hidden" runat="server" id="hdn_checkBoxResult" name="hdn_checkBoxResult" />
function theChecker(val)
{
if(val.Checked ==true)
{
$('.hdn_checkBoxResult').val(true);
alert('alert msg');
}
else
{
$('.hdn_checkBoxResult').val(false);
}
}
emailBody +="<tr>";
emailBody +="<td align='right' width='10%'><B><FONT face='Verdana' size='1'>Question ? </FONT></B></td>";
emailBody +="<td width='20%'><FONT face='Verdana' size='2'> " + hdn_checkBoxResult.Value + "</FONT></td>";
emailBody +="</tr>";
modified 18-Jun-15 15:29pm.
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Are you using asp.net control for submitting the form ?
If yes then use asp.net radio buttons for capturing values of 'Yes' or 'No'
as follows replace the html controls with asp.net controls.
If no then use asynchronous call to call the WebMethod in page and send values as bool or string.
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Thanks RajeshKasani it works now.
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I have some strings to represent the names of forms and controls.
for example;
MenuLogin = name of an instance of System.Windows.Forms.MenuItem
Now I want to assign Text value to the object whose name is the string at run time.
I.e:
s1 = "MenuExit"
Object(s1).Text = Exit login window //find an object,Name:MenuExit
I can't find a method in the Object that can search an object with name "MenuExit" in the application.
Please tell me how to implement it, thanks.
modified 17-Jun-15 15:29pm.
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