CSharp Items

index

CSharp Items

The methods and properties of the HttpResponse class are exposed through the Response 
property of the HttpApplication, HttpContext, Page, and UserControl classes.
This works: HttpContext.Current.Response.Write("<strong>Hello from clsTinettiMisc</strong><hr />")

In Web.config, I added a value for testing:
<appSettings>
	<add key="IsTesting" value="True"/>    
</appSettings>

At top of each class I have a boolean variable that reads the value in Web.config:
private bool _IsTesting = Convert.ToBoolean(System.Web.Configuration.WebConfigurationManager.AppSettings["IsTesting"]);
Private _IsTesting As Boolean = Convert.ToBoolean(System.Web.Configuration.WebConfigurationManager.AppSettings("IsTesting"))
What about this?
Private _IsTesting As Boolean = Convert.ToBoolean(System.Configuration.ConfigurationManager.AppSettings("IsTesting").ToString())


If (_IsTesting) Then
	HttpContext.Current.Response.Write("hdnTotalScore.Value = " & hdnTotalScore.Value & "<hr/>")
End If

If _IsTesting Then
	HttpContext.Current.Response.Write("In clsTUGTest.SaveData(): TUGTest_ID = " & TUGTest_ID.ToString() & "<hr/>")
End If

Somewhere else in the class, I have a function that takes in an Exception and outputs 
detailed information about it to the screen IF AND ONLY IF IsTesting is True:
private function:
private void ErrorMsgToResponse(Exception ex)
{
	string sEx = String.Format("Source: {0}" +
		"<br />TargetSite: {1}" +
		"<br />Message: {2}" +
		"<br />Exception: {3}" +
		"<br />InnerException: {4}<hr />",
		ex.Source, ex.TargetSite, ex.Message,
		ex.ToString(), ex.InnerException);
	if (_IsTesting) Response.Write(sEx);
}

usage:
try
{
	Code that might blow up.
	Code that might blow up.
	Code that might blow up.
	Code that might blow up.
	Code that might blow up.
}
catch (Exception ex)
{
	SendErrorMsgToResponse(ex);
}

The cool thing is, since the value is set in the Web.config, 
I can change it from False to True on the QA (or even production) site 
without re-compiling or re-deploying the code.

To get the local computer's time, when you want that instead of the server's DateTime.Now:

/*
PURPOSE: assuming there is a hidden control on a page called hdnClientSideDate,
gets the user machine's date and formats it so that C#'s DateTime.TryParse() 
can read it, and puts that value into hdnClientSideDate, to replace DateTime.Now
aka server time for OnTime Incidents.
*/
function GetClientSideTime() {
    var hdnDate = $("#<%= hdnClientSideDate.ClientID %>");
    if (hdnDate.length > 0) {
        var d = new Date();
        var month = d.getMonth() + 1;
        hdnDate.val(d.getFullYear() + "-" + month.toString() + "-" + d.getDate() + " " + d.getHours() + ":" + d.getMinutes() + ":" + d.getSeconds());
    }
    return true;
}

In code:
<!-- to pass local DateTime to server -->
<asp:HiddenField ID="hdnClientSideDate" runat="server" />

Code behind:
private DateTime _clientSideDate = DateTime.Now;
public DateTime ClientSideDate
{
	get { return _clientSideDate; }
	set { DateTime.TryParse(hdnClientSideDate.Value, out _clientSideDate); }
}

To get a valid email address:

<asp:ValidationSummary ID="vldAddEditEquipmentSummary" runat="server" CssClass="validation" Style="margin-top:-5px; margin-bottom:10px;" EnableClientScript="true" DisplayMode="BulletList"  HeaderText="The Following Error(s) Occurred:" ShowSummary="true"  ValidationGroup="AddEditEquipment" Visible="true" />

<label>Alt Email Address:</label>
<asp:TextBox ID="txtAltEmailAddress" runat="server" style="margin-left:2px;" />
<asp:RegularExpressionValidator
	ValidationExpression="^\s*[\w\.\-]+@[a-zA-Z0-9\-]+(\.[a-zA-Z0-9\-]{1,})*(\.[a-zA-Z]{2,3}){1,2}\s*$"
	EnableClientScript="true"               
	ID="vldAltEmailAddress" runat="server" Display="None" 
	ControlToValidate="txtAltEmailAddress" ValidationGroup="AddEquipmentRequest" 
	ErrorMessage="Alt Email Address must be in a valid email address format." />

google: string to stream c sharp

http://www.csharp411.com/c-convert-string-to-stream-and-stream-to-string/
To convert a C# String to a MemoryStream object, use the GetBytes Encoding method to create a byte array, then pass that to the MemoryStream constructor:
	byte[] byteArray = Encoding.ASCII.GetBytes( test );
	MemoryStream stream = new MemoryStream( byteArray );

Convert Stream to String
To convert a Stream object (or any of its derived streams) to a C# String, create a StreamReader object, then call the ReadToEnd method:
	StreamReader reader = new StreamReader( stream );
	string text = reader.ReadToEnd();
	
----- OR -----

string test = "Testing 1-2-3";

// convert string to stream
MemoryStream stream = new MemoryStream();
StreamWriter writer = new StreamWriter( stream );
writer.Write( test );
writer.Flush();

// convert stream to string
stream.Position = 0;
StreamReader reader = new StreamReader( stream );
string text = reader.ReadToEnd();

google: C# stream to file
	http://www.java2s.com/Tutorial/CSharp/0300__File-Directory-Stream/SavetheMemoryStreamasafile.htm
	
google: c# write stream to response

http://gargmanoj.wordpress.com/2008/07/17/writing-a-memorystream-to-response-object-for-opening-a-open-save-cancel-dialogue-in-aspnet-20/
Following code block can be used to show user on Open/Save/Cancel dialogue box in browser for a memory stream.
	if (ms != null)
	{
		Byte[] byteArray = ms.ToArray();
		ms.Flush();
		ms.Close();
		Response.BufferOutput = true;
		// Clear all content output from the buffer stream
		Response.Clear();
		//to fix the “file not found” error when opening excel file
		//See http://www.aspose.com/Community/forums/ShowThread.aspx?PostID=61444
		Response.ClearHeaders();
		// Add a HTTP header to the output stream that specifies the default filename
		// for the browser’s download dialog
		string timeStamp = Convert.ToString(DateTime.Now.ToString(“MMddyyyy_HHmmss”));
		Response.AddHeader(“Content-Disposition”, “attachment; filename=testFileName_” + timeStamp + “.fileextention”);
		// Set the HTTP MIME type of the output stream
		Response.ContentType = “application/octet-stream”;
		// Write the data
		Response.BinaryWrite(byteArray);
		Response.End();
	}
	
This is what I did in C:\VRM\Products\ITServices\1.0\SourceCode\VRM.ITServices.Website\Directory\ADPUpload.aspx.cs
	string file = sbFile.ToString();
	byte[] bytes = Encoding.ASCII.GetBytes(file);
	Response.Clear();
	Response.ClearHeaders();
	//attachment makes the save as dialog appear in this case
	Response.AddHeader("Content-Disposition", string.Concat("attachment; filename=", importFileName));
	Response.AddHeader("Content-Type", "application/octet-stream");
	Response.BinaryWrite(bytes);
	Response.End();