Uri does not exist

Comments

• SafeTK

  September 2025

  I have been using the Fast Report .NET Designer to generate the .rpt file. The code page always has default using statements. I had tried a combination of different attempts but still cannot seem to get EscapeDataString to work. I may just end up writing my own function for escaping the strings. Below are my attempts.

  -----

  using System;

  Uri.EscapeDataString(myString);

  
  

  This previews in the Designer but not from my API using FastReport.Net v 2025.1.16

  "Exception occurred: (21,15): Error CS0103: The name 'Uri' does not exist in the current context\r\n"

  -----

  using System;

  System.Uri.EscapeDataString(myString);

  
  

  This previews in the Designer but not from my API using FastReport.Net v 2025.1.16

  "Exception occurred: (21,15): Error CS1069: The type name 'Uri' could not be found in the namespace 'System'. This type has been forwarded to assembly 'System.Private.Uri, Version=0.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' Consider adding a reference to that assembly.\r\n"

  -----

  using System;

  using System.Private;

  System.Private.Uri.EscapeDataString(myString);

  
  

  In the Designer, 

  "Error CS0234: The type or namespace name 'Private' does not exist in the namespace 'System' (are you missing an assembly reference?)"

  From the API,

  "Exception occurred: (22,15): Error CS0234: The type or namespace name 'Uri' does not exist in the namespace 'System.Private' (are you missing an assembly reference?)\r\n"

  -----

  using System;

  using System.Net;

  Uri.EscapeDataString(myString);

  
  

  This previews in the Designer but not from my API using FastReport.Net v 2025.1.16

  "Exception occurred: (22,19): Error CS0117: Please, don't use the method 'EscapeDataString'\r\n"

  -----

  using System;

  using System.Net;

  System.Net.Uri.EscapeDataString(myString);

  
  

  This previews in the Designer but not from my API using FastReport.Net v 2025.1.16

  "Exception occurred: (22,19): Error CS0117: Please, don't use the method 'EscapeDataString'\r\n"
• stg

  1:42PM

  Hello!

  To resolve your issue, wrap the data in C# and pass the final value to the report:

  var rows = source.Select(x => new Row
  {
  Url = x.Url,
  EscapedUrl = Uri.EscapeDataString(x.Url) // standard C#, outside the report script
  }).ToList();
  
  report.RegisterData(rows, ‘Rows’);
  report.SetParameterValue(‘BlobUrl’, Uri.EscapeDataString(url));
  

  If you need the function specifically within an expression, register your own static function and call it as [EscapeUri([Rows.Url])].