SOLIDWORKS C# API - Fix Unit Issue

3 minute read

Objective

I want to:

Fix Unit issue for input values using Solidworks C# API.

For more Details on why Fixing Unit issue, please visit 🚀 Solidworks Macro - Fix Unit Issue article.

We will continue from previous article 🚀 WPF Tutorials - Create Line UI - Part 2 article.

Demo Video

Below 🎬 video shows how to “Fix Unit Issue” in Solidworks C# API.

Please note that there are no explanation in the video.
Explanation of each step and why we write code this way is given in this post.

Add [UnitConversionHelper] class

First we add Helper folder in our solution.
Then we add UnitConversionHelper class inside “Helper” folder.
Please see below 👇🏻 image for reference.

Add [Public Properties]

First we need to create a region.
- Region Name: Public Properties
Inside this region, we we need 2 properties.
Please see below 👇🏻 for code reference.

                        #region Public Properties
public double LengthConversionFactor { get; set; }

public double AngleConversionFactor { get; set; }
#endregion

In above code, we create 2 properties.
- Name of 1st property: LengthConversionFactor
- Name of 2nd property: AngleConversionFactor
- Type of both properties: double
We expose them as public members, so that we can use them in other classes.

Add [Public Method]

Now we need to add a method to UnitConversionHelper class.
First we need to create a region.
- Region Name: Public Method
Inside this Public Method region, we need to create a method.
Method Name: UnitConversion
Method Return Type: void [means this method did not return anything]
Method parameters:
- Name of parameter: swUnit
- Type of parameter: swLengthUnit_e [Parameter for Solidworks Length Unit in current document.]
Method Purpose: Depending upon the value of swUnit parameter, we will modify the values of LengthConversionFactor and AngleConversionFactor properties.
Please see below 👇🏻 for code reference.

                        #region Public Method
public void UnitConversion(swLengthUnit_e swUnit)
{
    
}
#endregion

                      

Please see below 👇🏻 image for reference.

Update Properties Value

Now we need to update values of LengthConversionFactor and AngleConversionFactor properties.
For this, we will use if-else if conditional statement.
Please see below 👇🏻 for code reference.

                        #region Public Method
public void UnitConversion(swLengthUnit_e swUnit)
{
    if (swUnit == swLengthUnit_e.swMETER)
    {
        LengthConversionFactor = AngleConversionFactor = 1;
    }
    else if (swUnit == swLengthUnit_e.swMM)
    {
        LengthConversionFactor = 1 / 1000;
        AngleConversionFactor = 1 * 0.01745329;
    }
    else if (swUnit == swLengthUnit_e.swCM)
    {
        LengthConversionFactor = 1 / 100;
        AngleConversionFactor = 1 * 0.01745329;
    }
    else if (swUnit == swLengthUnit_e.swINCHES)
    {
        LengthConversionFactor = 1 * 0.0254;
        AngleConversionFactor = 1 * 0.01745329;
    }
    else if (swUnit == swLengthUnit_e.swFEET)
    {
        LengthConversionFactor = 1 * (0.0254 * 12);
        AngleConversionFactor = 1 * 0.01745329;
    }
    else if (swUnit == swLengthUnit_e.swFEETINCHES)
    {
        LengthConversionFactor = 1 * 0.0254;
        AngleConversionFactor = 1 * 0.01745329;
    }
}
#endregion

                      

In above code, we are checking value of swUnit parameter.
Depending upon the value of swUnit parameter, we will update values of LengthConversionFactor and AngleConversionFactor properties accordingly.

Register [UnitConversionHelper]

Now we need to register UnitConversionHelper class into DI container.
After registering class, we can create instance of UnitConversionHelper class through DI container.
For this, go to “App.xaml.cs” class.
In “App.xaml.cs” class, inside RegisterTypes method, we register UnitConversionHelper method into DI container.
Please see below 👇🏻 for code reference.

                        protected override void RegisterTypes(IContainerRegistry containerRegistry)
{
    containerRegistry.Register<PointViewModel>();
    containerRegistry.RegisterSingleton<UnitConversionHelper>();
}

                      

Please see below 👇🏻 image for reference.

In above code, we register UnitConversionHelper class as Singleton.
By doing this, we only has single instance of UnitConversionHelper class in our application.

This is it !!!

I hope my efforts will helpful to someone!

If you found anything to add or update, please let me know on my e-mail.

Hope this post helps you to fix Unit issue in Solidworks application.

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Till then, Happy learning!!!