# Not entry point found tiledb\_query\_get\_field C# **URL:** \ **Category:** Uncategorized\ **Created:** [March 7, 2024, 10:46pm UTC](https://forum.tiledb.com/t/not-entry-point-found-tiledb-query-get-field-c/663 "2024-03-07T22:46:10Z")\ **Posts on this page:** 13\ **Page:** 1
**Author:** ![kunaal\_desai](https://yyz1.discourse-cdn.com/flex035/user_avatar/forum.tiledb.com/kunaal_desai/32/323_2.png) [@kunaal\_desai](https://forum.tiledb.com/u/kunaal_desai)\ **Post date:** [March 7, 2024, 10:46pm UTC](https://forum.tiledb.com/t/not-entry-point-found-tiledb-query-get-field-c/663/1 "2024-03-07T22:46:10Z")
I have some C# code which looks like following //Create array > public void CreateArray(string uri, ArrayDimension rowDimension, ArrayDimension columnDimension) > { > try > { > using (var ctx = new Context()) > { > var domain = new Domain(ctx); > domain.AddDimensions( > Dimension.Create(ctx, “rows”, rowDimension.Start, rowDimension.End, rowDimension.TileExtent), > Dimension.Create(ctx, “cols”, columnDimension.Start, columnDimension.End, columnDimension.TileExtent) > ); > > ``` > // The array will be dense. > var schema = new ArraySchema(ctx, ArrayType.Dense); > schema.SetDomain(domain); > > var xNorm = new TileDB.CSharp.Attribute(ctx, "x_norm", DataType.Float64); > var yNorm = new TileDB.CSharp.Attribute(ctx, "y_norm", DataType.Float64); > > schema.AddAttributes(xNorm, yNorm); > Array.Create(ctx,uri,schema); > } > } > catch (Exception e) > { > Console.WriteLine(e); > throw; > } > > } > > ``` and then write to the array using following code: > public void WriteArrayFloat(string arrayName, List xNorm, List yNorm, int index, int size) > { > try > { > using var ctx = new Context(); > using (var array = new Array(ctx, arrayName)) > { > array.Open(QueryType.Write); > using Subarray subArray = new Subarray(array); > subArray.SetSubarray(index, index, 1, size); > using (var query = new Query(ctx, array, QueryType.Write)) > { > query.SetLayout(LayoutType.RowMajor); > query.SetDataBuffer(“x\_norm”, xNorm.ToArray()); > query.SetDataBuffer(“y\_norm”, yNorm.ToArray()); > query.SetSubarray(subArray); > > ``` > Console.WriteLine("Writing started"); > // Perform the write and close the array. > query.Submit(); > array.Close(); > } > } > Console.WriteLine("Writing done!!"); > } > catch (Exception e) > { > Console.WriteLine(e); > throw; > } > > } > > ``` when it tries to setBuffer, it throws the following error: not entry point found tiledb\_query\_get\_field tiledb Why idea why? I am using Tiledb.Csharp 5.10.0 ---
**Author:** ![teo-tsirpanis](https://yyz1.discourse-cdn.com/flex035/user_avatar/forum.tiledb.com/teo-tsirpanis/32/324_2.png) [@teo-tsirpanis](https://forum.tiledb.com/u/teo-tsirpanis)\ **Post date:** [March 8, 2024, 12:20am UTC](https://forum.tiledb.com/t/not-entry-point-found-tiledb-query-get-field-c/663/2 "2024-03-08T00:20:29Z")
Hello @kunaal_desai. I tried reproducing the issue by running a program similar to yours but failed. Under normal circumstances, the native TileDB library is downloaded from NuGet but the error message you encountered indicates that it did not happen, and a mismatched version of TileDB got picked from somewhere else. Could you add a `Console.WriteLine($"Using TileDB {CoreUtil.GetCoreLibVersion()}");` in your program and tell me the result? Furthermore, in order for NuGet to download the binaries for the correct platform, you should be specifying [a runtime identifier](https://learn.microsoft.com/en-us/dotnet/core/project-sdk/msbuild-props#runtimeidentifier) when building (if you don’t you should be getting a warning). Are you doing that, and if not, are you getting a warning? Could you also tell me more about your environment? What is the operating system and .NET version that you are using? Thanks ---
**Author:** ![kunaal\_desai](https://yyz1.discourse-cdn.com/flex035/user_avatar/forum.tiledb.com/kunaal_desai/32/323_2.png) [@kunaal\_desai](https://forum.tiledb.com/u/kunaal_desai)\ **Post date:** [March 8, 2024, 1:04am UTC](https://forum.tiledb.com/t/not-entry-point-found-tiledb-query-get-field-c/663/3 "2024-03-08T01:04:01Z")
The console.writeline has a result: Using TileDB 2.15.0 The only warning that I see when I build is warning : The TileDB native library will be imported only when performing an RID-specific build. See the README of the TileDB.CSharp package for more information. I also added the following code to my .csproj ```auto osx-x64 ``` I also have following packages referenced. ```auto ``` ---
**Author:** ![kunaal\_desai](https://yyz1.discourse-cdn.com/flex035/user_avatar/forum.tiledb.com/kunaal_desai/32/323_2.png) [@kunaal\_desai](https://forum.tiledb.com/u/kunaal_desai)\ **Post date:** [March 8, 2024, 1:14am UTC](https://forum.tiledb.com/t/not-entry-point-found-tiledb-query-get-field-c/663/4 "2024-03-08T01:14:32Z")
One. a side note, I have brew installed tile-db on the machine. Could that version be in conflict with this version? How is it related with the package Tiledb.csharp? ---
**Author:** ![teo-tsirpanis](https://yyz1.discourse-cdn.com/flex035/user_avatar/forum.tiledb.com/teo-tsirpanis/32/324_2.png) [@teo-tsirpanis](https://forum.tiledb.com/u/teo-tsirpanis)\ **Post date:** [March 8, 2024, 1:19am UTC](https://forum.tiledb.com/t/not-entry-point-found-tiledb-query-get-field-c/663/5 "2024-03-08T01:19:35Z")
The TileDB Homebrew packages are [deprecated since version 2.15](https://github.com/TileDB-Inc/homebrew-stable#install-tiledb-from-brew). I suggest you uninstall it and try again. ---
**Author:** ![kunaal\_desai](https://yyz1.discourse-cdn.com/flex035/user_avatar/forum.tiledb.com/kunaal_desai/32/323_2.png) [@kunaal\_desai](https://forum.tiledb.com/u/kunaal_desai)\ **Post date:** [March 8, 2024, 4:19am UTC](https://forum.tiledb.com/t/not-entry-point-found-tiledb-query-get-field-c/663/6 "2024-03-08T04:19:27Z")
What package should my tile-db be? ---
**Author:** ![teo-tsirpanis](https://yyz1.discourse-cdn.com/flex035/user_avatar/forum.tiledb.com/teo-tsirpanis/32/324_2.png) [@teo-tsirpanis](https://forum.tiledb.com/u/teo-tsirpanis)\ **Post date:** [March 8, 2024, 11:36am UTC](https://forum.tiledb.com/t/not-entry-point-found-tiledb-query-get-field-c/663/7 "2024-03-08T11:36:17Z")
> What package should my tile-db be? For C#, TileDB will be downloaded with the `TileDB.Native` NuGet package. Other languages have their own mechanism of acquiring TileDB (such as Conda or pip for Python). ---
**Author:** ![kunaal\_desai](https://yyz1.discourse-cdn.com/flex035/user_avatar/forum.tiledb.com/kunaal_desai/32/323_2.png) [@kunaal\_desai](https://forum.tiledb.com/u/kunaal_desai)\ **Post date:** [March 8, 2024, 11:33pm UTC](https://forum.tiledb.com/t/not-entry-point-found-tiledb-query-get-field-c/663/8 "2024-03-08T23:33:58Z")
Thank you. It worked. I really appreciate your help. On a side note, I am trying to port some of the c++ code to C# and I was already expecting some lag but what I saw was a Huge difference in performance. Is this expected? ---
**Author:** ![ihnorton](https://yyz1.discourse-cdn.com/flex035/user_avatar/forum.tiledb.com/ihnorton/32/23_2.png) [@ihnorton](https://forum.tiledb.com/u/ihnorton)\ **Post date:** [March 11, 2024, 2:29am UTC](https://forum.tiledb.com/t/not-entry-point-found-tiledb-query-get-field-c/663/9 "2024-03-11T02:29:32Z")
Hi @kunaal_desai, if you are specifically comparing usage of the TileDB C++ API vs equivalent usage of the TileDB C# API, then could you please share a minimal, non-proprietary reproduction? (both original C++, and comparable C#). ---
**Author:** ![kunaal\_desai](https://yyz1.discourse-cdn.com/flex035/user_avatar/forum.tiledb.com/kunaal_desai/32/323_2.png) [@kunaal\_desai](https://forum.tiledb.com/u/kunaal_desai)\ **Post date:** [March 11, 2024, 4:47am UTC](https://forum.tiledb.com/t/not-entry-point-found-tiledb-query-get-field-c/663/10 "2024-03-11T04:47:53Z")
Do you want me to post it here or on a new thread? ---
**Author:** ![kunaal\_desai](https://yyz1.discourse-cdn.com/flex035/user_avatar/forum.tiledb.com/kunaal_desai/32/323_2.png) [@kunaal\_desai](https://forum.tiledb.com/u/kunaal_desai)\ **Post date:** [March 11, 2024, 5:03am UTC](https://forum.tiledb.com/t/not-entry-point-found-tiledb-query-get-field-c/663/11 "2024-03-11T05:03:27Z")
When I call this c++ code from my C# adapter: ```auto void write_array_float(char* array_name, std::vector x_norm,std::vector y_norm, int index, int size) { Context ctx; unsigned int microseconds; std::cout<< "The first element being written in tiledb.h is " + std::to_string(x_norm[0]) << std::endl; std::vector subarray = {index, index, 1 ,size}; // Open the array for writing and create the query. Array array(ctx, array_name, TILEDB_WRITE); Query query(ctx, array, TILEDB_WRITE); query.set_layout(TILEDB_ROW_MAJOR) .set_buffer("x_norm", x_norm) .set_buffer("y_norm", y_norm) .set_subarray(subarray); std::cout<<"Writting started" << std::endl; // Perform the write and close the array. query.submit(); array.close(); std::cout<<"Writting done!!" << std::endl; } ``` However, when I translated this code into a C# code: ```auto public void WriteArrayFloat(string arrayName, List xNorm, List yNorm, int index, int size) { try { using var ctx = new Context(); using (var array = new Array(ctx, arrayName)) { array.Open(QueryType.Write); using Subarray subArray = new Subarray(array); subArray.SetSubarray(index, index, 1, size); using (var query = new Query(ctx, array, QueryType.Write)) { query.SetLayout(LayoutType.RowMajor); query.SetDataBuffer("x_norm", xNorm.ToArray()); query.SetDataBuffer("y_norm", yNorm.ToArray()); query.SetSubarray(subArray); Console.WriteLine("Writing started"); // Perform the write and close the array. query.Submit(); array.Close(); } } Console.WriteLine("Writing done!!"); } catch (Exception e) { Console.WriteLine(e); throw; } } ``` This one is pretty slow. And just for some context, the difference is the magnitude of the difference. I can post more code if needed. ---
**Author:** ![ihnorton](https://yyz1.discourse-cdn.com/flex035/user_avatar/forum.tiledb.com/ihnorton/32/23_2.png) [@ihnorton](https://forum.tiledb.com/u/ihnorton)\ **Post date:** [March 11, 2024, 11:57am UTC](https://forum.tiledb.com/t/not-entry-point-found-tiledb-query-get-field-c/663/12 "2024-03-11T11:57:31Z")
Thanks - if you can post a complete example that will definitely save us some time (build files etc.). Maybe a new github repo and share? ---
**Author:** ![kunaal\_desai](https://yyz1.discourse-cdn.com/flex035/user_avatar/forum.tiledb.com/kunaal_desai/32/323_2.png) [@kunaal\_desai](https://forum.tiledb.com/u/kunaal_desai)\ **Post date:** [March 12, 2024, 4:14am UTC](https://forum.tiledb.com/t/not-entry-point-found-tiledb-query-get-field-c/663/13 "2024-03-12T04:14:08Z")
I think I found the issue. The issue was with my tile configuration of tile-element. While porting the code from C++ to C#, I by mistake, changed the tile-element configuration and that caused the issue with the writing speed. The issue is resolved now.