.NET Archives - Page 3 of 6

Databindings - small values treated as 0s

Today, I encountered an interesting problem with WinForms. In the application, NumericUpDowns (shown below) were used with small values e.g. 0.00001 etc. However, after we refreshed the panel, the value was being set to the default value. Digging further into the problem it turned out that the default Microsoft DataBinding converter was unable to convert

How to use - (dash) in the ASP.NET MVC call?

ActionName attribute can be used:

[HttpGet]
[ActionName("edit-details")]
public ActionResult EditDetails()
{
    return View("EditDetails", new ModifyViewModel());
}

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[HttpGet]

[ActionName("edit-details")]

public ActionResult EditDetails()

{

return View("EditDetails", new ModifyViewModel());

}

How to override MongoDB connection details in appsettings.json on Azure

It is actually pretty simple to override the connection settings in Azure. If you manage your connection inside the appsettings.json:

  "MongoConnection": {
    "ConnectionString": "mongodb://admin:abc123!@localhost",
    "Database": "YourDb"
  }

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"MongoConnection": {

"ConnectionString": "mongodb://admin:abc123!@localhost",

"Database": "YourDb"

}

Then in Azure you should define these in Application Settings -> App settings. Seperate the layers by ":" (semi-colon). For example: Key: MongoConnection:ConnectionString Value: mongodb://admin:abc123!@localhost. Similarly, the database (key) MongoConnection:Database value: YourDb

Extracting Username and Password from Basic Authentication

Basic authentication is one of the most fundamental ways in which authentication can be performed. It does not require multiple calls and is very easy to learn. In this article, I will present how to use C# (usually with WCF) to extract basic authentication credentials from the request. Step 1 - Understanding Basic Authentication Whenever

Set background color for all buttons in WPF

Hehe, simple enough thing, but took long enough. You need to use resources to do it.

    <Window.Resources>
    </Window.Resouces>

1 2	<Window.Resources> </Window.Resouces>

In there you can define styles:

    <Style TargetType="Button">
        <Setter Property="Background" Value="#7DC7C5"/>
    </Style>

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</Style>

It is simple enough to read: apply it to buttons. Property: Background set the value to whatever color you like.

Lists of Lists in C# - if one is updated, all are updated.

I was doing an assessment for university regarding password cracking. They say that experience is something that cannot be learnt. Never that notion has been more true than today when I was attempting to create a list of lists: List<List<string>>. I had "virtually" unbounded memory, but I had to make sure that I could maximise

Serializing Anonymous DataMemeber

I've been working win MVC Web API and encountered an annoying problem. It does not, by default serialise anonymous data members.

[DataMember]
public object text = new { status = "generated", div = "<table><tr><th>Code</th><th>Interpreation</th></tr></table>"};

1 2	[DataMember] public object text = new { status = "generated", div = "<table><tr><th>Code</th><th>Interpreation</th></tr></table>"};

When you try to serialise this kind of data you get this beautiful exception:

Type '<>f__AnonymousType3`2[System.String,System.String]' cannot be serialised. Consider marking it with the DataContractAttribute attribute, and marking all of its members you want to be serialized with the DataMemberAttribute attribute.  If the type is a collection, consider marking it with the CollectionDataContractAttribute.  See the Microsoft .NET Framework documentation for other supported types.

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Type '<>f__AnonymousType3`2[System.String,System.String]' cannot be serialised. Consider marking it with the DataContractAttribute attribute, and marking all of its members you want to be serialized with the DataMemberAttribute attribute. If the type is a collection, consider marking it with the CollectionDataContractAttribute. See the Microsoft .NET Framework documentation for other supported types.

Converting anonymous type to a string also caused exception. But there is also JavaScriptSerializer:

    var x = new { blah = "afd" };
    JavaScriptSerializer serializer = new JavaScriptSerializer();
    var serialized = serializer.Serialize(x);

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var x = new { blah = "afd" };

JavaScriptSerializer serializer = new JavaScriptSerializer();

var serialized = serializer.Serialize(x);

Now using getter,

Useful Linear Trendline Class in C#

I've searched and searched trying to find a simple class to calculate a slope and intercept from a set of points. Here is the outcome, but I probably modify it to use LINQ rather then loops

    public class Trendline
    {
        /// <summary>
        /// Get's the line's best fit slope of the line
        /// </summary>
        public double Slope { get; private set; }

        /// <summary>
        /// Get's the Mia
        /// </summary>
        public double Offset { get; private set; }

        public double[] ValuesX { get; private set; } 

        public double[] ValuesY { get; private set; }

        private double sumY;

        private double sumX;

        private double sumXY;

        private double sumX2;

        private double n;

        public Trendline(double[] x, double[] y)
        {
            this.ValuesX = x;
            this.ValuesY = y;

            this.sumXY = this.calculateSumXsYsProduct(this.ValuesX, this.ValuesY);
            this.sumX = this.calculateSumXs(this.ValuesX);
            this.sumY = this.calculateSumYs(this.ValuesY);
            this.sumX2 = this.calculateSumXsSquare(this.ValuesX);
            this.n = this.ValuesX.Length;

            this.calculateSlope();
            this.calculateOffset();
        }

        public Trendline(double[] y)
        {
            //Assinging Y Values
            this.ValuesY = y;
            int length = y.Length;
            //Assinging X Values
            this.ValuesX = new double[length];
            for (int i = 0; i < length; i++)
            {
                this.ValuesX[i] = i;
            }


            this.sumXY = this.calculateSumXsYsProduct(this.ValuesX, this.ValuesY);
            this.sumX = this.calculateSumXs(this.ValuesX);
            this.sumY = this.calculateSumYs(this.ValuesY);
            this.sumX2 = this.calculateSumXsSquare(this.ValuesX);
            this.n = this.ValuesX.Length;
        }

        public Trendline(double[][] xy)
        {
            double[] xs = new double[xy.Length];
            double[] ys = new double[xy.Length];
            for (int i = 0; i < xy.Length; i++)
            {
                xs[i] = xy[i][0];
                ys[i] = xy[i][1];
            }
            this.ValuesX = xs;
            this.ValuesY = ys;
        }

        private double calculateSumXsYsProduct(double[] xs, double[] ys)
        {
            double sum = 0;
            for (int i = 0; i < xs.Length; i++)
            {
                sum += xs[i] * ys[i];
            }
            return sum;
        }

        private double calculateSumXs(double[] xs)
        {
            double sum = 0;
            foreach (double x in xs) {
                sum += x;
            }
            return sum;
        }

        private double calculateSumYs(double[] ys)
        {
            double sum = 0;
            foreach (double y in ys)
            {
                sum += y;
            }
            return sum;
        }

        private double calculateSumXsSquare(double[] xs)
        {
            double sum = 0;
            foreach (double x in xs)
            {
                sum += System.Math.Pow(x,2);
            }
            return sum;
        }

        private void calculateSlope()
        {
            try
            {
                Slope = (n * sumXY - sumX * sumY) / (n * sumX2 - System.Math.Pow(sumX,2));
            }
            catch (DivideByZeroException)
            {
                Slope = 0;
            }
        }

        private void calculateOffset()
        {
            try
            {
                Slope = (sumY - Slope * sumX) / n;
            }
            catch (DivideByZeroException) { }
        }
    }

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public class Trendline

{

/// <summary>

/// Get's the line's best fit slope of the line

/// </summary>

public double Slope { get; private set; }

/// <summary>

/// Get's the Mia

/// </summary>

public double Offset { get; private set; }

public double[] ValuesX { get; private set; }

public double[] ValuesY { get; private set; }

private double sumY;

private double sumX;

private double sumXY;

private double sumX2;

private double n;

public Trendline(double[] x, double[] y)

{

this.ValuesX = x;

this.ValuesY = y;

this.sumXY = this.calculateSumXsYsProduct(this.ValuesX, this.ValuesY);

this.sumX = this.calculateSumXs(this.ValuesX);

this.sumY = this.calculateSumYs(this.ValuesY);

this.sumX2 = this.calculateSumXsSquare(this.ValuesX);

this.n = this.ValuesX.Length;

this.calculateSlope();

this.calculateOffset();

}

public Trendline(double[] y)

{

//Assinging Y Values

this.ValuesY = y;

int length = y.Length;

//Assinging X Values

this.ValuesX = new double[length];

for (int i = 0; i < length; i++)

{

this.ValuesX[i] = i;

}

this.sumXY = this.calculateSumXsYsProduct(this.ValuesX, this.ValuesY);

this.sumX = this.calculateSumXs(this.ValuesX);

this.sumY = this.calculateSumYs(this.ValuesY);

this.sumX2 = this.calculateSumXsSquare(this.ValuesX);

this.n = this.ValuesX.Length;

}

public Trendline(double[][] xy)

{

double[] xs = new double[xy.Length];

double[] ys = new double[xy.Length];

for (int i = 0; i < xy.Length; i++)

{

xs[i] = xy[i][0];

ys[i] = xy[i][1];

}

this.ValuesX = xs;

this.ValuesY = ys;

}

private double calculateSumXsYsProduct(double[] xs, double[] ys)

{

double sum = 0;

for (int i = 0; i < xs.Length; i++)

{

sum += xs[i] * ys[i];

}

return sum;

}

private double calculateSumXs(double[] xs)

{

double sum = 0;

foreach (double x in xs) {

sum += x;

}

return sum;

}

private double calculateSumYs(double[] ys)

{

double sum = 0;

foreach (double y in ys)

{

sum += y;

}

return sum;

}

private double calculateSumXsSquare(double[] xs)

{

double sum = 0;

foreach (double x in xs)

{

sum += System.Math.Pow(x,2);

}

return sum;

}

private void calculateSlope()

{

try

{

Slope = (n * sumXY - sumX * sumY) / (n * sumX2 - System.Math.Pow(sumX,2));

}

catch (DivideByZeroException)

{

Slope = 0;

}

private void calculateOffset()

{

try

{

Slope = (sumY - Slope * sumX) / n;

}

catch (DivideByZeroException) { }

}

Footer from database in MVC ASP.NET

I've been struggling for a while to find a sensible way of getting the footer. Well... This is where partial views come useful. There are several ways to solve this problem. I've created a controller:

public class _OtherController : Controller
{
    Models.DBEntities _db = new Models.DBEntities();

    [ChildActionOnly]
    public ActionResult _Footer()
    {
        Footer viewModel = new Footer();
        return PartialView("_FooterPartial", viewModel);
    }
}

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public class _OtherController : Controller

{

Models.DBEntities _db = new Models.DBEntities();

[ChildActionOnly]

public ActionResult _Footer()

{

Footer viewModel = new Footer();

return PartialView("_FooterPartial", viewModel);

}

In the Shared folder I've added _FooterPartial.cshtml and in the layout this line:

@{Html.RenderAction("_Footer", "_Other");}

1	@{Html.RenderAction("_Footer", "_Other");}

It worked so awesome.

Partial View not being published

I encountered a bit of a problem today. I've added a partial view manually to the project (i.e. it wasn't generated by the VS). To my annoyance, when I deployed the application to the test server the *.cshtml was not copied. After a bit of digging around, I found the problem. It turned out that

Category: .NET

Databindings - small values treated as 0s

How to use - (dash) in the ASP.NET MVC call?

How to override MongoDB connection details in appsettings.json on Azure

Extracting Username and Password from Basic Authentication

Set background color for all buttons in WPF

Lists of Lists in C# - if one is updated, all are updated.

Serializing Anonymous DataMemeber

Useful Linear Trendline Class in C#

Footer from database in MVC ASP.NET

Partial View not being published

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