DapperLib/Dapper

View on GitHub

Dapper - a simple object mapper for .Net

Stars: 18.4k
Forks: 3.7k
Open beginner issues: 0
Indexed issues: 466
Avg merge: 5h 8m
Merged PRs (30d): 1

Dominant language: C#
License: No license data
Last GitHub push: Sep 12, 2026
Latest indexed: Sep 20, 2026
Contributing guide: No contributing guide
Code of conduct: No code of conduct
Beginner labels: No beginner labels indexed

Beginner friendly Everything

Open All

466 open issues indexed

Not passing paramater value with @> PostgreSQL operator Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

DapperLib/Dapper#740 · 3 comments · Opened Apr 14, 2017
[Proposal] UnknownTypeHandler Open

proposal

Difficulty 5/5 Over a week Newbie friendliness 25/100

DapperLib/Dapper#734 · Opened Apr 3, 2017
Dapper on ODBC - IN statement Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

DapperLib/Dapper#728 · 1 comment · Opened Mar 18, 2017
V2: [Column] and [Table] Attributes Open

area:mapping enhancement proposal

Difficulty 5/5 Over a week Newbie friendliness 25/100

DapperLib/Dapper#722 · 83 comments · 74 reactions · Opened Mar 14, 2017
Microsoft.Data.Sqlite and Guid column Open

area:typehandlers db:sqlite

Difficulty 3/5 1-2 days Newbie friendliness 35/100

DapperLib/Dapper#718 · 20 comments · Opened Mar 6, 2017
"Value cannot be null" exception on query Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

DapperLib/Dapper#714 · 7 comments · Opened Mar 1, 2017
Suggestion for mapping non-standard Enums Open

area:typehandlers

Difficulty 4/5 3-5 days Newbie friendliness 35/100

DapperLib/Dapper#694 · Opened Feb 8, 2017
Dapper v3 planning and discussion Open

area:api proposal v3.0

Difficulty 5/5 Over a week Newbie friendliness 20/100

DapperLib/Dapper#688 · 29 comments · 31 reactions · Opened Jan 28, 2017
QueryMultiple: Error parsing column Open

area:typehandlers db:oracle

Difficulty 4/5 3-5 days Newbie friendliness 35/100

DapperLib/Dapper#658 · 1 comment · Opened Dec 12, 2016
Unable to pass an empty table-valued parameter through Dapper Open

Difficulty 3/5 1-2 days Newbie friendliness 32/100

DapperLib/Dapper#649 · 3 comments · 1 reaction · Opened Nov 29, 2016
OrWhere() causing unexpected behavior in Where() Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

DapperLib/Dapper#647 · 6 comments · 6 reactions · Opened Nov 28, 2016
Sqlite: InvalidCastException if the first value in a column is NULL followed by any other value Open

db:sqlite

Difficulty 3/5 1-2 days Newbie friendliness 50/100

DapperLib/Dapper#642 · 33 comments · 1 reaction · Opened Nov 17, 2016
C# Guid to Oracle blob throw the System.ArgumentException:value does not fall within the expected range Open

area:mapping area:typehandlers db:oracle

Difficulty 4/5 3-5 days Newbie friendliness 25/100

DapperLib/Dapper#633 · 13 comments · 1 reaction · Opened Oct 26, 2016
Insert using Dapper and Always Encrypted Open

db:sql-server

Difficulty 4/5 3-5 days Newbie friendliness 25/100

DapperLib/Dapper#632 · 11 comments · Opened Oct 25, 2016
Access both GetRowParser and GridReader.Read<TFirst,TSecond,TReturn> on the same query Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

DapperLib/Dapper#624 · 1 comment · 1 reaction · Opened Oct 3, 2016
Passing parameters object with static property causes dapper to fail with cryptic exception. Open

bug v3.0

Difficulty 4/5 3-5 days Newbie friendliness 35/100

DapperLib/Dapper#621 · 4 comments · Opened Sep 27, 2016
WHERE IN issue for ODBC in 1.50.2 Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

DapperLib/Dapper#619 · 2 comments · Opened Sep 21, 2016
SimpleMemberMap became internal between 1.42 and 1.50.2 Open

area:api breaking-change v3.0

Difficulty 4/5 3-5 days Newbie friendliness 30/100

DapperLib/Dapper#613 · 1 reaction · Opened Sep 15, 2016
SetValue is not invoked in a Dapper custom TypeHandler Open

breaking-change v3.0

Difficulty 3/5 1-2 days Newbie friendliness 35/100

DapperLib/Dapper#607 · 5 comments · Opened Sep 10, 2016
Telling Dapper not to use properties as parameters to create stored procedure Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

DapperLib/Dapper#598 · 2 comments · 2 reactions · Opened Sep 1, 2016
Unbuffered QueryAsnyc multi-mapping throws an InvalidOperationException Open

v3.0

Difficulty 4/5 3-5 days Newbie friendliness 52/100

DapperLib/Dapper#596 · 9 comments · 2 reactions · Opened Sep 1, 2016
Stored procedure - dbType:System.Date - Always Encrypted bug Open

DapperLib/Dapper#585 · 3 comments · 1 assignee · Opened Aug 18, 2016
DateTime columns from database have Kind property Unspecified. Open

feature request

Difficulty 3/5 1-2 days Newbie friendliness 35/100

DapperLib/Dapper#571 · 7 comments · 3 reactions · Opened Jul 26, 2016
Querying for empty list fails with MySQL Server 5.6 Open

db:mysql

Difficulty 3/5 1-2 days Newbie friendliness 35/100

DapperLib/Dapper#565 · 18 comments · 5 reactions · Opened Jul 20, 2016
Dapper cancelling only ExecuteReaderAsync not Reader.ReadAsync with MultiMap Open

v3.0

Difficulty 3/5 1-2 days Newbie friendliness 35/100

DapperLib/Dapper#555 · 2 comments · 2 reactions · Opened Jul 11, 2016
Bad performance when reading CLOBs on Oracle Open

area:settings db:oracle

Difficulty 3/5 1-2 days Newbie friendliness 38/100

DapperLib/Dapper#546 · 6 comments · 1 reaction · Opened Jun 30, 2016
How to pass IEnumerable<T> (or 'rows of data') as parameter? Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

DapperLib/Dapper#541 · 4 comments · Opened Jun 20, 2016
Dapper doesn't use prepared statements Open

v3.0

Difficulty 5/5 Over a week Newbie friendliness 25/100

DapperLib/Dapper#474 · 14 comments · 4 reactions · Opened Feb 29, 2016
Dapper - reader.IsConsumed is false even after reading the last resultset Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 42/100

DapperLib/Dapper#469 · 9 comments · Opened Feb 23, 2016
Dapper does not find correct constructor for objects with MySqlDateTime in mySql Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

DapperLib/Dapper#456 · 1 reaction · Opened Feb 9, 2016
Invalid cast from 'System.String' to 'System.Guid' Open

area:typehandlers enhancement

Difficulty 4/5 3-5 days Newbie friendliness 30/100

DapperLib/Dapper#447 · 26 comments · 1 reaction · Opened Feb 1, 2016
Use TypeHandler for all types Open

v3.0

Difficulty 5/5 Over a week Newbie friendliness 25/100

DapperLib/Dapper#433 · 6 comments · 8 reactions · Opened Jan 6, 2016
Audit where DbCommand.Cancel() is called Open

v3.0

DapperLib/Dapper#417 · 1 assignee · Opened Nov 29, 2015
Materializing objects inheriting from DynamicObject Open

deserialization enhancement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

DapperLib/Dapper#406 · 4 comments · Opened Nov 22, 2015
Retrieving decimal value from db causing an issue. Open

deserialization needs-investigation

Difficulty 3/5 1-2 days Newbie friendliness 45/100

DapperLib/Dapper#405 · 3 comments · Opened Nov 20, 2015
Data table generator for table-valued parameters Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

DapperLib/Dapper#389 · 4 comments · Opened Nov 10, 2015
Let's make the type mapper more pluggable. Open

area:mapping documentation enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

DapperLib/Dapper#385 · 7 comments · Opened Nov 6, 2015
`Variable Already Declared` when Shadowed/New Properties exist in Hierarchy of Model Open

deserialization

Difficulty 4/5 3-5 days Newbie friendliness 35/100

DapperLib/Dapper#381 · 9 comments · Opened Nov 4, 2015
Dynamic Parameters with Table Valued Parameters Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

DapperLib/Dapper#364 · 4 comments · 2 reactions · Opened Oct 26, 2015
DynamicParameters.ParameterNames does not provide names from "template" objects Open

needs-investigation

Difficulty 3/5 1-2 days Newbie friendliness 35/100

DapperLib/Dapper#343 · 3 comments · 5 reactions · Opened Sep 16, 2015
No Way to Pass Enumerated Types to Underlying Implementation Open

db:postgresql

Difficulty 3/5 1-2 days Newbie friendliness 35/100

DapperLib/Dapper#332 · 14 comments · 8 reactions · Opened Aug 28, 2015
Mapping of TimeSpan to DbType.Time is too restrictive Open

breaking-change

Difficulty 3/5 1-2 days Newbie friendliness 35/100

DapperLib/Dapper#319 · 1 comment · Opened Jul 17, 2015
Select in with uuid array not working in Postgresql Open

db:postgresql needs-investigation

DapperLib/Dapper#315 · 8 comments · 1 assignee · Opened Jul 13, 2015
List Support doens't work. Open

db:postgresql needs-investigation

DapperLib/Dapper#314 · 4 comments · 1 reaction · 1 assignee · Opened Jul 9, 2015
Dapper TVP mapping via ordinal instead of by name? Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

DapperLib/Dapper#306 · 17 comments · 1 reaction · Opened Jun 19, 2015
Please provide public getter to access DynamicParameters' parameters dictionary object Open

area:api enhancement needs-investigation

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

DapperLib/Dapper#304 · 9 comments · 6 reactions · Opened Jun 12, 2015
Dapper custom TypeHandler SetValue not being called? Open

bug needs-investigation v3.0

Difficulty 4/5 3-5 days Newbie friendliness 25/100

DapperLib/Dapper#303 · 6 comments · 2 reactions · Opened Jun 11, 2015
No plan to have multimap support for GridReader.ReadAsync? Open

enhancement needs-investigation

Difficulty 3/5 1-2 days Newbie friendliness 38/100

DapperLib/Dapper#296 · 3 comments · 9 reactions · Opened Jun 7, 2015
TypeHandler not working correctly with DynamicParameters Open

area:typehandlers

Difficulty 3/5 1-2 days Newbie friendliness 45/100

DapperLib/Dapper#275 · 9 comments · Opened Apr 20, 2015
QueryMultiple on sproc with 4 result sets reading too much data on second Read command Open

needs-investigation

Difficulty 4/5 3-5 days Newbie friendliness 38/100

DapperLib/Dapper#272 · 15 comments · Opened Apr 17, 2015

DapperLib/Dapper

Get new issues in your inbox