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https://forums.asp.net/t/1796259.aspx?how+to+solve+this+DataSet+does+not+support+System+Nullable+
Apr 24, 2012 · DataTable b= CollectionHelper.ConvertTo(a); i get: DataSet does not support System.Nullable<>. in a previous project in worked ok, but now i get this. Re: how to solve this: DataSet does not support System.Nullable<>. Nullable.GetUnderlyingType, and perhaps change a few null values to DbNull.Value...
https://stackoverflow.com/questions/58336506/dataset-does-not-support-system-nullable-error-on-linq
you define a data column with a nullable type (double? That's not necessary: The DataTable/DataColumn classes support nullability for all data types out of the box (since those classes predate .NET generics and, thus, .NET value type nullability).
https://social.msdn.microsoft.com/Forums/en-US/55064dee-7e6b-40ca-80ff-43e96675b65c/dataset-does-not-support-systemnullable-while-converting-dlinq-query-result-to-datatable
Feb 09, 2011 · DataSet does not support System.Nullable while converting dlinq query result to datatable. Archived Forums I-L > ... The LINQ Project delivers Language Integrated Query (LINQ) for objects, relational, XML, and other forms of data. 4 1. Question; text/html …
https://www.codeproject.com/questions/1021140/dataset-does-not-support-system-nullable
You are using LINQ to fetch records and bind list to report. It seems some column value is NULL in linq query which doesn't support dataset in report. In order to resolve your problem please use anonymous type and check null value of columns. Here it is checking null value and assigning some blank value to it.
https://answers.sap.com/questions/4838081/crystal-reports-2008-does-not-support-linq-or-null.html
So, while a method is available to pass an IEnumerable, any object passed that does not convert to a DataSet will result in an error being thrown. Bottom line is that until SetDataSource is re-written to work without converting to a DataSet, LINQ will only be supported as long as there are no nullable Foreign Keys or Columns.
https://blogs.msdn.microsoft.com/dataaccesstechnologies/2009/04/08/how-to-convert-an-ienumerable-to-a-datatable-in-the-same-way-as-we-use-tolist-or-toarray/
Apr 08, 2009 · But what if you want to convert the enumerable to a DataTable. There is no built in extension method for that currently. var v = (from x in collection Select x).ToDataTable (); But if required we can create our own extension method as shown below.
https://www.experts-exchange.com/questions/27256610/System-NotSupportedException-was-caught-Message-DataSet-does-not-support-System-Nullable-in-Crystal-Reports-using-LINQ-Query.html
System.NotSupportedException was caught Message=DataSet does not support System.Nullable<> in Crystal Reports using LINQ Query. >>, but the return data has some null values. It is throwing "DataSet does not support System.Nullable", please see the exception below.
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