DapperLib/Dapper

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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

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466 open issues indexed

Supporting coding utf8mb4 Open

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

DapperLib/Dapper#1272 · 5 comments · Opened Jun 5, 2019
Streaming data support Open

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

DapperLib/Dapper#1265 · 3 reactions · Opened May 16, 2019
Rainbow.Database - some extension points are needed Open

area:rainbow feature request

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

DapperLib/Dapper#1253 · Opened May 6, 2019
Rainbow.Dapper.Database.Dispose(true) should never throw an exception Open

area:rainbow

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

DapperLib/Dapper#1252 · 2 comments · Opened May 6, 2019
Identity.ForGrid shouldn't set parametersType to the new Identity Open

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

DapperLib/Dapper#1245 · Opened Apr 25, 2019
Can't get value of output parameters if the stored procedure doesn't perform any SELECT statement Open

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

DapperLib/Dapper#1244 · Opened Apr 23, 2019
DynamicParameters.RemoveUnused does not remove IEnumerable-parameters Open

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

DapperLib/Dapper#1241 · 1 comment · 1 reaction · Opened Apr 18, 2019
SQLBuilder how to define multiple OR conditions? Open

area:sqlbuilder

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

DapperLib/Dapper#1240 · 1 comment · 1 reaction · Opened Apr 15, 2019
out of memory error when not able to parse collumn Open

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

DapperLib/Dapper#1238 · Opened Apr 12, 2019
Confusing error message when setter is missing Open

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

DapperLib/Dapper#1237 · 2 comments · 3 reactions · Opened Apr 11, 2019
TypeHandler not used for null values Open

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

DapperLib/Dapper#1234 · 2 comments · 3 reactions · Opened Apr 8, 2019
Question about @value substitution Open

Difficulty 3/5 1-2 days Newbie friendliness 25/100

DapperLib/Dapper#1231 · 16 comments · Opened Apr 5, 2019
Add indexer to DynamicParameters so that C# 7 dictionary initializer syntax can be used Open

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

DapperLib/Dapper#1230 · 2 reactions · Opened Apr 5, 2019
F# Anonymous records support in query results Open

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

DapperLib/Dapper#1226 · 11 comments · 4 reactions · Opened Apr 3, 2019
Bug: TypeHandler.Parse not called with Scalar* methods Open

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

DapperLib/Dapper#1218 · 1 comment · 2 reactions · Opened Mar 26, 2019
QueryMultiple with Multimap callback Func not called Open

needs-info

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

DapperLib/Dapper#1208 · 1 comment · Opened Mar 13, 2019
InvalidCastException - Converting DB type Int64 to C# IComparable Open

feature request

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

DapperLib/Dapper#1207 · 3 comments · Opened Mar 12, 2019
TableValueParameter Ignores any Custom TypeHandlers Open

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

DapperLib/Dapper#1201 · 3 comments · Opened Mar 1, 2019
PackListParameters should check `IEnumerable<DbString>` before FeatureSupport.Arrays Open

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

DapperLib/Dapper#1193 · Opened Feb 19, 2019
Missed CancellationToken for QueryAsync with an arbitrary number of input types Open

area:api breaking-change

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

DapperLib/Dapper#1181 · 12 comments · 14 reactions · Opened Jan 23, 2019
Brief descriptions of the auxiliary projects Open

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

DapperLib/Dapper#1171 · 2 reactions · Opened Jan 1, 2019
Mapping geography field to a POCO field Open

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

DapperLib/Dapper#1170 · 1 reaction · Opened Dec 27, 2018
Dapper looses parameters Open

bug

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

DapperLib/Dapper#1169 · 9 comments · Opened Dec 18, 2018
Unsigned type mapping overflow Open

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

DapperLib/Dapper#1164 · 7 comments · 3 reactions · Opened Dec 5, 2018
Npgsql.PostgresException: 42809: op ANY/ALL (array) requires array on right side Open

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

DapperLib/Dapper#1153 · 5 comments · 3 reactions · Opened Nov 5, 2018
How I can read Parent - Child DataSet into object structure (If it possible) Open

Difficulty 3/5 1-2 days Newbie friendliness 25/100

DapperLib/Dapper#1151 · 2 comments · Opened Oct 30, 2018
Poor error message when using 'DynamicParameter.Output<T>' on property without setter Open

Difficulty 2/5 1-3 hours Newbie friendliness 48/100

DapperLib/Dapper#1148 · 1 reaction · Opened Oct 26, 2018
Multiple WHERE IN statements and ODBC Open

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

DapperLib/Dapper#1145 · 6 comments · 2 reactions · Opened Oct 19, 2018
parameter-list is not working for where in clause for teradata Open

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

DapperLib/Dapper#1142 · 3 comments · Opened Oct 17, 2018
Dynamic Parameters Naming for DB2 Open

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

DapperLib/Dapper#1138 · 2 comments · Opened Oct 9, 2018
IN clause doesn't support SqlMapper.TypeHandler Open

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

DapperLib/Dapper#1134 · 4 reactions · Opened Sep 27, 2018
ISNULL on nullable decimal property when value is null uses wrong decimal precision Open

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

DapperLib/Dapper#1130 · 2 comments · Opened Sep 18, 2018
Equals / GetHashCode inconsistent in Identity object Open

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

DapperLib/Dapper#1122 · 1 comment · 1 reaction · Opened Sep 10, 2018
MySQL - DateTime default value Open

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

DapperLib/Dapper#1120 · 4 comments · Opened Sep 8, 2018
Get Parameter Names from non used DynamicParameters Open

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

DapperLib/Dapper#1113 · Opened Aug 31, 2018
Auto Generation of Interface Proxies? Open

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

DapperLib/Dapper#1104 · Opened Aug 24, 2018
Guid convert to String issue Open

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

DapperLib/Dapper#1096 · 2 reactions · Opened Aug 13, 2018
Best way to override Database.Insert() (Dapper.Rainbow) Open

Difficulty 5/5 Over a week Newbie friendliness 15/100

DapperLib/Dapper#1087 · Opened Jul 31, 2018
DynamicParameters.AddDynamicParams interpolation for Stored Procedure Open

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

DapperLib/Dapper#1085 · Opened Jul 30, 2018
Load-test of Async: Slow or Errors Open

Difficulty 4/5 3-5 days Newbie friendliness 20/100

DapperLib/Dapper#1081 · 1 comment · 1 reaction · Opened Jul 25, 2018
Is Dapper.Rainbow not supporting SQLite? Open

area:rainbow

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

DapperLib/Dapper#1080 · 2 comments · Opened Jul 20, 2018
How do I unit test Dapper? Open

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

DapperLib/Dapper#1074 · 26 comments · 27 reactions · Opened Jul 18, 2018
The connection's current state is connecting Open

needs-info

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

DapperLib/Dapper#1072 · 9 comments · Opened Jul 17, 2018
What is "efficient" execution of multiple commands? Open

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

DapperLib/Dapper#1071 · 4 comments · Opened Jul 11, 2018
Trying to assert contents of DynamicParameters Open

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

DapperLib/Dapper#1068 · 1 comment · Opened Jul 10, 2018
Mapping a cascade dataobject that relies on multiple tables Open

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

DapperLib/Dapper#1065 · Opened Jul 4, 2018
Add database-compatibility-matrix to readme Open

documentation up-for-grabs

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

DapperLib/Dapper#1060 · 2 comments · 1 reaction · Opened Jun 28, 2018
Invalid cast exception. Workaround to convert data type. Open

Difficulty 3/5 1-2 days Newbie friendliness 30/100

DapperLib/Dapper#1058 · 1 comment · Opened Jun 27, 2018
Wrong constructor signature detection when using Microsoft.Data.Sqlite Open

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

DapperLib/Dapper#1057 · Opened Jun 26, 2018
Error parsing null value into nullable property Open

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

DapperLib/Dapper#1042 · Opened Jun 13, 2018

DapperLib/Dapper

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