Making a cross platform Forms App for Windows, Mac, iPhone, Android

I just installed .NET CORE for Mac and selected Project > New Solution but was surprised to not find an option for Windows. iOS is iPhone and Mac, true?

Anyway, do I build the entire app once for these four platforms? Or do I build common objects and need to create custom UI's for the mobile side with Xamarin?

Thanks

Baby steps into .NET Core

I'm a CE.NET developer who has worked on the full .NET stack, including MVC. I used to program Windows applications using Win Forms.

What do you suggest as my first baby steps into .NET Core?

My intention is to create a cross-platform application for Windows, Mac and UNIX, but I prefer coding in Mac, if possible.

I do have Visual Studio Code on my MacBook, but I also have a Windows partition.

What options to I have for development platform?

What steps do I need to take before I can write my first Hello World application?

Tanks.

What are the big benefits of .NET CORE?

And how do they differentiate from .NET Framework?

Please high level what microservices can do?

And from a C# perspective, what is the best way to create them?

.NET CORE?

etc...

SSRS Report Builder - Export to CSV issue; Double Quotes exist for each record.

We have a report that is scheduled to produce a CSV file.
This file is consumed by another application and requires specific formatting in order to successfully process the file.
The following entry has been configured within the 'rsreportserver.config' file:

<Extension Name="CSV (No Header)" Type="Microsoft.ReportingServices.Rendering.DataRenderer.CsvReport,Microsoft.ReportingServices.DataRendering">
                        <OverrideNames>
                              <Name Language="en-AU"> CSV No Header</Name>
                        </OverrideNames>
                        <Configuration>
                              <DeviceInfo>
                                    <NoHeader>true</NoHeader>
                                    <Extension>CSV</Extension>
                                    <Encoding>UTF-8</Encoding>
                                    <Qualifier></Qualifier>
                              </DeviceInfo>
                        </Configuration>
                  </Extension>

The file that is being generated from this contains double quotes at the start and end of each record (see below).
"""FORMAT BATCH IMPORT, STANDARD 1.0"""
"DREF1,DDATE1,DSOURCE,DCLRENTITY,DENTITYPE,LLDGCODE,LACCNBR,LAMOUNT1,LNARR1,LNARR2,LNARR3,LPRESCSTAT,LGSTTYPE,LGSTRATECODE,BIMPNAME,BCLRENTITY"
"180603,06/06/2018,AB,123,A,AB,123456789,-1234.56,Team Journal,21/05/2018 to 03/06/2018,12345,N,I,NA,TEAMJNL,123"

The output we need is shown below:
"""FORMAT BATCH IMPORT, STANDARD 1.0"""
DREF1,DDATE1,DSOURCE,DCLRENTITY,DENTITYPE,LLDGCODE,LACCNBR,LAMOUNT1,LNARR1,LNARR2,LNARR3,LPRESCSTAT,LGSTTYPE,LGSTRATECODE,BIMPNAME,BCLRENTITY
…

Dear Experts,

I have an asp.net website that uses identity 2.1 (I'm pretty sure > 2.0 anyways as near as I can tell). It is written in visual basic. I ran into a weird issue the other day where people were logging in and getting this viewstate error:

Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that <machineKey> configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster.

So I followed the advice I found in the microsoft article and added a machine key to the web.config file so that no matter what it (hopefully) shouldn't get that error again.

Once the machine key was changed to one that I set now we had issues with anyone with an already existant authorization cookie on their computer, they were unable to login. I believe it's because the machine key that I set no longer matched the one that was used in their cookie. I'm not entirely clear how, but apparently it's part of how it's encrypted. If they clear their cookies, all is well - then they could login.

So one bit of advice I found searching on the web sounded super simple and super-easy. They recommended that you have some sort of set key in your web.config, like a guid or something and then you add it to your cookie also. Then, when you load the cookie, you can check the key and if it doesn't match your server key, somehow you invalidate the cookie.

I basically spent all day trying to figure out …

background: had vs2010, 2013, and 2017 community.   Just uninstalled 2010 and 2013 because of issues.  

I have a project with a component that we wrote, in vs2010 & .net 4.0.  I've created a new solution, imported the old projects within the solution.   It now have .net 4.7.1 since 4.0 is not available in the list anymore (and not downloadable apparently).   This component was using the Extensibility Tool (which i've installed on vs2017).

But i still have some errors, all related to this component:

CS0616	ProvideToolboxControlAttribute' is not an attribute class
CS0641	Attribute 'AttributeUsage' is only valid on classes derived from System.Attribute

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Note: within this file, beside System and System.Globalization, all the other "Using" are greyed out, like if they where not used.  

Anyone can help?  These classes are deprecated? (AttributeUsage?)  How can i solve this issue?

Thanks
ProvideToolboxControlAttribute.cs

Whenever I perform a search within a document in Visual Studio it always highlights this characters below, besides the word I searched for, which makes it very hard to find what I was searching for:
 <%
%>

How can I disable highlighting those characters ?

Testing for dataset changes on form closing in WinForms 2015.

   

    If DS.HasChanges Then
            ChangesMade = True
             'Call Option to save code
        End If
        For Each dr As DataRow In DS.Tables("tCARDS").Rows
            If dr.RowState <> DataRowState.Unchanged Then
                ChangesMade = True

            End If
            If dr.HasVersion(DataRowVersion.Proposed) Then
                ChangesMade = True
            End If
        Next

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The trouble is that when the user moves between datarows using a datagridview or bindingnavigator the Dataset is marked as changed.  It also shows the rowstate as being modified when it isn't.  The user isn't changing anything just navigating amongst records.  I'd like to figure out how to check for any true changes rather then getting the false positive?

Any ideas?


Thanks

We currently use Visual Studio 2008 v9.0.  When one user opens a proc on Monday (but does not check it out as they have no intention at that time to make changes) if another user checks out the proc on Tuesday , makes changes and checks it in.  There is nothing to stop the first user from making changes to the proc as he/she  has it in front of him (fro  Monday) and overwrite the changes that user 2 made on Tues.
Is there a way to prevent this - e.g. automatically refresh, or not allow changes checked in if not using the latest file or the problem seems to be that if you have a proc open, you can directly make changes and it will then get flagged as checked out, perhaps if this could be disabled so that the only way to check out a proc would be to reopen from scratch

I created a custom ContextMenuStrip at runtime on an overrided RichTextBox control (to enable Cancel, Cut, Copy and Paste basic functions on my overrided RichTextBox) - since the RichTextBox doesn't implement this out-of-the-box.
At runtime, I do get my ContextMenuStrip popping up when I right click on my overrided RichTextBox and the menus work well, BUT when I move the mouse over the ContextMenuStrip, I don't see the selection tracker over the menus. Why so? And how can I fix this?

       
        private void CreateContextMenuStrip()
        {
            _cms = new ContextMenuStrip();
            _cms.Items.Add(new ToolStripLabel("Annuler", null, false, cms_Clicked, "mnuCancel"));
            _cms.Items.Add(new ToolStripSeparator());
            _cms.Items.Add(new ToolStripLabel("Couper", null, false, cms_Clicked, "mnuCut"));
            _cms.Items.Add(new ToolStripLabel("Copier", null, false, cms_Clicked, "mnuCopy"));
            _cms.Items.Add(new ToolStripLabel("Coller", null, false, cms_Clicked, "mnuPaste"));
            _cms.Items.Add(new ToolStripSeparator());
            _cms.Items.Add(new ToolStripLabel("Tout sélectionner", null, false, cms_Clicked, "mnuSelectAll"));
            _cms.Items["mnuSelectAll"].Width = 150;
            _cms.Opening += new CancelEventHandler(cms_Opening);
            this.ContextMenuStrip = _cms;
        }

        private void cms_Opening(object sender, CancelEventArgs e)
        {
            // check to see if we can 

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