Develop Reference

OutOfMemoryException while parsing a file

I am retrieving an System.OutOfMemoryException while parsing an image file. Please see the code below.
Additional information:
The image size is about 10 mb.
64 bit architecture with 8GB RAM
DataTable contains more then 8000 records
if(dt.Rows.Count > 0)
{
for ( int i=0; i< dt.Rows.Count; i++ )
{
string photoId = #"\\192.168.123.123\MwPict\" + dt.Rows[i]["DmCtg"] + "\\DM 3D " + dt.Rows[i]["dmcd"] + ".jpg";
string base64 = "";
string images = "";
byte[] byteArray = null;
try
{
// byteArray = File.ReadAllBytes(photoId);
base64 = Convert.ToBase64String(File.ReadAllBytes(photoId));
images = string.Format("data:image/gif;base64,{0}", base64);
}
catch (FileNotFoundException ee)
{
images = "#";
}
byteArray = null;
base64 = null;
photoId = null;
data += "<tr>";
data += "<td>" + dt.Rows[i]["SR"] + "</td>";
data += "<td><img src = '" + images + "' height = '60px' width = '60px' alt = 'photo' /></ td>";
data += "<td>" + dt.Rows[i]["dmcd"] + "</td>";
data += "<td>"+dt.Rows[i]["DmCtg"] +"</td>";
data += "<td>" + dt.Rows[i]["DmPrdCtg"] + "</td>";
data += "<td>" + dt.Rows[i]["DmSalCtg"] + "</td>";
data += "<td>" + dt.Rows[i]["DsgDate"] + "</td>";
data += "</tr>";
}

How to insert a table in an SMTP email? And the list includes a double

The following code does not put everything in an email. The only result is the word test. When I run all code, there is data from the database. What am I missing to get the data to populate in the email table?
performanceCompare += "<table>";
//Compares last hour today......need to compare to another day results
var performDate = ErrDb.PerformanceDatas.Where(d => d.loggedAt > hourlyBegin && d.loggedAt < hourlyEnd).ToList();
var performanceDataOneDay = ErrDb.PerformanceDatas.Where(o => o.loggedAt > dayBegin && o.loggedAt < dayEnd).ToList();
performanceCompare += "<tr>";
performanceCompare += "<td><b>test</b></td>";
performanceCompare += "</tr>";
var avgTimeList = new List<AvgTime>();
var specialIDS = performDate.Select(x => new {x.sitename, x.functionName }) .Distinct();
foreach (var key in specialIDS)
{
var funComapre = performDate.Where(g => g.functionName == key.functionName && g.sitename == key.sitename);
AvgTime avgTime = new AvgTime();
avgTime.siteName = "<tr>" + key.sitename + "</tr>";
avgTime.functionName = "<td>" + funComapre.Select(x => x.functionName).First() + "</td>";
avgTime.avgFunctTime = "<td>" + (funComapre.Select(x => x.functionTime).Average()) + "</td>";//needs to be a string, not a double
avgTimeList.Add(avgTime);
var anotherFunComapre = performanceDataOneDay.Where(g => g.functionName == key.functionName && g.sitename == key.sitename);
if (anotherFunComapre != null)
{
AvgTime anotherAvgTime = new AvgTime();
avgTime.siteName = "<tr>" + key.sitename + "</tr>";
avgTime.functionName = "<td>" + funComapre.Select(x => x.functionName).First() + "</td>";
anotherAvgTime.avgFunctTime = funComapre.Select(x => x.functionTime).Average();
avgTimeList.Add(anotherAvgTime);
}
}
performanceCompare += "</table>";

How to save DataGrid data to CSV file without enumerating the query result again?

I am using this command to get data from my query:
private void loadData()
{
numRows = 0;
try
{
data = gpso.gpEntitiesObject.ExecuteStoreQuery<My_Class>(sql);
dataGrid.ItemsSource = data;
dataGrid.IsReadOnly = true;
numRows = dataGrid.Items.Count;
numRowsTB.Text = "Number of rows: " + numRows;
}
catch (Exception ex)
{
statusBarTB.Text = "exception: " + ex.Message;
}
}
Although this works and I see the data in my DataGrid, I am not able to save the data to a CSV file since I am trying to reenumerate the query result again, which is not allowed.
What would be the right way to get the data and save it to CSV?
Should I use the DataGrid API to scroll trough the rows and get the data in a foreach() loop?
Here is my CSV function:
public static string exportToCSV(IEnumerable<My_Class> data, string separator)
{
string ishod = "";
string csvRed = "";
ishod += "Key1" + separator + "Key2" + separator;
ishod += "Key3" + separator + "Key4" + separator;
ishod += "\n";
foreach (My_Class item in data)
{
csvRed += item.Key1+ separator + item.Key2+ separator;
csvRed += item.Key3+ separator + item.Key4+ separator;
csvRed += "\n";
ishod += csvRed;
csvRed = "";
}
return ishod;
}

I followed #Clemens advice. I used
IEnumerable dataList = data.ToList<My_Class>();
dataGrid.ItemSource = dataList;
I then called
exportToCSV(dataList, "\t");
with dataList as parameter and it worked!

HTML generate rowspan in html table string

I have the following code, which adds rowspan to a datatable in an html string, but I want it not to receive as a parameter a datatable, but instead to receive as a parameter an html string in C#.
protected void Page_Load(object sender, EventArgs e)
{
DataTable dt = new DataTable();
dt.Columns.Add("Subject");
dt.Columns.Add("Code");
dt.Columns.Add("Test");
dt.Columns.Add("Class");
dt.Rows.Add("Math", "9", "ABC", "D1");
dt.Rows.Add("Math", "9", "ABD", "D2");
dt.Rows.Add("Math", "9", "ABE", "D3");
dt.Rows.Add("Math", "9", "ABF", "D4");
dt.Rows.Add("Science", "91", "ABG", "D1");
dt.Rows.Add("Science", "91", "ABH", "D2");
dt.Rows.Add("Science", "91", "ABI", "D3");
dt.Rows.Add("English", "191", "ABJ", "D1");
Label1.Text = ConvertDataTableToHTML(dt);
}
public static string ConvertDataTableToHTML(DataTable dt)
{
string html = "<table border=1>";
//add header row
html += "<tr>";
for (int i = 0; i < dt.Columns.Count; i++)
{
html += "<td>" + dt.Columns[i].ColumnName + "</td>";
}
html += "</tr>";
//add rows
string sub = "";
for (int i = 0; i < dt.Rows.Count; i++)
{
html += "<tr>";
int count = dt.Select("Subject ='" + dt.Rows[i][0].ToString() + "'").Count();
for (int j = 0; j < dt.Columns.Count; j++)
{
if (j < 2)
{
if (sub != dt.Rows[i][0].ToString())
{
html += "<td rowspan='" + count + "'>" + dt.Rows[i][j].ToString() + "</td>";
}
continue;
}
html += "<td>" + dt.Rows[i][j].ToString() + "</td>";
}
sub = dt.Rows[i][0].ToString();
html += "</tr>";
}
html += "</table>";
return html;
}
This is the result that I hope

There are a few things wrong with the code, and a few ways you can improve your code:
<table border=1> is missing the quotes around the 1. It should be <table border='1'>.
You are missing the <thead> and <tbody> tags around the row tags.
Instead of constantly using +=, use a StringBuilder.
To make your code cleaner, you can change some of your for loops to foreach loops.
Your code should be changed to something like this:
public static string ConvertDataTableToHTML(DataTable dt)
{
StringBuilder builder = new StringBuilder();
//add header row
builder.Append("<table border='1'><thead><tr>");
foreach (DataColumn col in dt.Columns)
{
builder.Append("<td>");
builder.Append(col.ColumnName);
builder.Append("</td>");
}
builder.Append("</tr></thead><tbody>");
//add rows
string sub = "";
...
builder.Append("</tbody></table>");
return builder.ToString();
}
(Just apply the same concepts to the middle code that I removed.)

Accessing Application and Service logs with C#

I was wondering if there is a way to reach the logs under the section named Application and Service Logs in the Event viewer utility in Windows. The thing is, I can read the entries under Windows Logs with the code below. I read the whole entry, and get the items with the necessary id, getting top 20 results. But I couldn't find anything on accessing the Application and Service logs section. Should I change the LogType in the EventLog constructor? Or is there a different method or class to access Application and Service logs? Trying "Application" as the logType variable doesnt work.
string str = "";
EventLog ev = new EventLog(logType, System.Environment.MachineName);
int LastLogToShow = ev.Entries.Count;
if (LastLogToShow <= 0)
Console.WriteLine("No Event Logs in the Log :" + logType);
int i;
int k = 0;
for (i = ev.Entries.Count - 1; i >= 0; i--)
{
EventLogEntry CurrentEntry = ev.Entries[i];
if (CurrentEntry.EventID == id)
{
if (id == 1)
{
str += "Son Açılma \n";
str += "Olay Zamanı: " + CurrentEntry.TimeGenerated.ToLongDateString() + " " + CurrentEntry.TimeGenerated.ToShortTimeString() + "\n";
}
else if (id == 42)
{
str += "Son Kapatılma \n";
str += "Olay Zamanı: " + CurrentEntry.TimeGenerated.ToLongDateString() + " " + CurrentEntry.TimeGenerated.ToShortTimeString() + "\n";
}
else
{
str += "Event type: " + CurrentEntry.EntryType.ToString() + "\n";
str += "Event Message: " + CurrentEntry.Message + CurrentEntry + "\n";
str += "Event : " + CurrentEntry.UserName + "\n" + "\n";
str += "Olay Zamanı: " + CurrentEntry.TimeGenerated.ToLongDateString() + " " + CurrentEntry.TimeGenerated.ToShortTimeString() + "\n";
}
k++;
}
if (k > 20)
break;
}
ev.Close();
return str;
What I am looking for is under
Application and Service Logs/
Microsoft/
Windows/
TerminalServices-RemoteConnectionManager/
Operational/
Event ID 1149

I'm not sure you can access them using the EventLog class, or at least I couldn't figure out how. I did it using the EventLogQuery class instead.
I've provided an example below which I adapted from this post (C#: How to Query for an event log details with a given event id?), and should work for what you need:
using System.Diagnostics.Eventing.Reader;
string logType = "Microsoft-Windows-TerminalServices-RemoteConnectionManager/Operational";
string query = "*[System/EventID=1149]";
var elQuery = new EventLogQuery(logType, PathType.LogName, query);
var elReader = new EventLogReader(elQuery);
for (EventRecord eventInstance = elReader.ReadEvent(); eventInstance != null; eventInstance = elReader.ReadEvent())
{
// .. do stuff here
}