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
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466 open issues indexed

Dapper Postgresql not supporting json values to retrieve Open

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

DapperLib/Dapper#1569 · Opened Nov 10, 2020
Can't Adding new empty row to GridView with Query<dynamic>() Open

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

DapperLib/Dapper#1565 · Opened Nov 3, 2020
BUG - Cannot map query result to object? Open

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

DapperLib/Dapper#1554 · Opened Oct 9, 2020
Add Cross Apply To SqlBuilder Open

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

DapperLib/Dapper#1551 · 1 comment · 1 reaction · Opened Oct 2, 2020
Can I customize the BindByName property value or customize the CommandDefinition.cs? Open

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

DapperLib/Dapper#1546 · 2 comments · Opened Sep 25, 2020
Slowness when using large number of dynamic parameters Open

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

DapperLib/Dapper#1537 · 2 comments · 1 reaction · Opened Sep 11, 2020
Reducing the number of queries created with Decimal data types Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

DapperLib/Dapper#1536 · 5 comments · Opened Sep 10, 2020
Multiple Results and Multiple Mapping Open

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

DapperLib/Dapper#1532 · 2 comments · Opened Sep 1, 2020
Dapper project contribution guidelines Open

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

DapperLib/Dapper#1523 · 3 comments · Opened Aug 20, 2020
Document how to avoid SQL injection with Dapper on bobby-tables.com Open

documentation up-for-grabs

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

DapperLib/Dapper#1517 · 3 comments · Opened Aug 13, 2020
No columns Query ,By dapper 2.0.35,dotnet core 3.1 StoredProcedure DynamicParameters Open

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

DapperLib/Dapper#1514 · Opened Aug 10, 2020
`DateTime` loses precision when bound as a parameter Open

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

DapperLib/Dapper#1511 · 5 comments · 4 reactions · Opened Aug 6, 2020
QueryAsync hangs with Column Encryption Setting in MSSQL CN string Open

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

DapperLib/Dapper#1509 · Opened Jul 30, 2020
Explicit Constructor constructs the objects but doesn't pass correct values Open

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

DapperLib/Dapper#1501 · 2 comments · Opened Jul 17, 2020
Should DbDataReader implementations be supported that return System.Nullable<X> from GetFieldType? Open

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

DapperLib/Dapper#1498 · 2 comments · Opened Jul 9, 2020
GetLiteralTokens slow with large command texts Open

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

DapperLib/Dapper#1484 · 7 comments · Opened Jun 14, 2020
No columns were selected" when there is no result returned by a query in when using QueryMultiple Open

DapperLib/Dapper#1483 · 8 comments · 1 reaction · 1 assignee · Opened Jun 11, 2020
DynamicParameters should implement IEnumerable to support collection initializer syntax Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

DapperLib/Dapper#1479 · 1 reaction · Opened Jun 4, 2020
Stackoverflow when using async methods Open

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

DapperLib/Dapper#1475 · 5 comments · Opened May 27, 2020
Dapper with Postgres and DateTimeOffset not working Open

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

DapperLib/Dapper#1474 · Opened May 26, 2020
RAW select on postgres never returns Open

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

DapperLib/Dapper#1464 · 4 comments · Opened May 17, 2020
dapper batch update or insert is particularly slow Open

needs-info

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

DapperLib/Dapper#1441 · 3 comments · Opened Apr 27, 2020
SqlMapper AddTypeMap/RemoveTypeMap not thread safe Open

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

DapperLib/Dapper#1439 · 2 reactions · Opened Apr 22, 2020
QuerySingleOrDefaultAsync: Procedure or function has too many arguments specified Open

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

DapperLib/Dapper#1430 · 23 comments · 1 reaction · Opened Apr 1, 2020
Cannot map PostgreSQL text[] type to List<string> Open

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

DapperLib/Dapper#1424 · 3 comments · Opened Mar 23, 2020
Different DateTimeKind per property or database Open

feature request

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

DapperLib/Dapper#1419 · 1 comment · 1 reaction · Opened Mar 6, 2020
QueryAsync, non-buffered, with mapping throws "No columns were selected" Open

needs-info

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

DapperLib/Dapper#1418 · 6 comments · Opened Mar 3, 2020
Add convenience methods for IDbTransaction Open

feature request

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

DapperLib/Dapper#1414 · Opened Feb 18, 2020
slowness in select Open

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

DapperLib/Dapper#1397 · 10 comments · 1 reaction · Opened Jan 10, 2020
Nullable reference types Open

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

DapperLib/Dapper#1393 · 4 comments · 8 reactions · Opened Jan 5, 2020
DbString Length can silently truncate value Open

needs-info

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

DapperLib/Dapper#1390 · 4 comments · Opened Jan 2, 2020
API to obtain a GridReader given a data reader started outside Dapper Open

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

DapperLib/Dapper#1389 · 3 comments · Opened Jan 2, 2020
DateTime rounding error Open

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

DapperLib/Dapper#1377 · 6 comments · 1 reaction · Opened Nov 21, 2019
Problem with TypeDescriptor with NULL columns generated from Query<dynamic> Open

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

DapperLib/Dapper#1372 · 4 comments · Opened Nov 11, 2019
Out of memory exception Open

needs-info needs-investigation

DapperLib/Dapper#1370 · 9 comments · 1 assignee · Opened Nov 7, 2019
Gives wrong parameter name in Sqlite Open

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

DapperLib/Dapper#1368 · 2 comments · Opened Nov 3, 2019
Support for EF Core spatial data Open

enhancement feature request

DapperLib/Dapper#1366 · 6 comments · 1 assignee · Opened Oct 31, 2019
Stored procedure return value on multiple result sets Open

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

DapperLib/Dapper#1346 · 1 comment · Opened Oct 2, 2019
SqlMapper.GridReader constructor is internal and prevents mocking Open

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

DapperLib/Dapper#1338 · 4 comments · 5 reactions · Opened Sep 24, 2019
Sql with `in` clause fails with PostgreSQL Open

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

DapperLib/Dapper#1324 · 7 comments · Opened Sep 5, 2019
Error parsing column {index} ({name}={formattedValue}) has wrong formattedValue Open

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

DapperLib/Dapper#1323 · 5 comments · Opened Sep 3, 2019
FeatureSupport broken when using a wrapped IDbConnection Open

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

DapperLib/Dapper#1318 · 6 comments · Opened Aug 28, 2019
Could you add the entity name and property name to method TypeHandlerCache<T>.Parse? Open

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

DapperLib/Dapper#1316 · Opened Aug 24, 2019
SqlMapper.TypeHandler<DateTime>.SetValue not work when use sqlite Open

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

DapperLib/Dapper#1315 · Opened Aug 24, 2019
I have a suggestion that I hope dapper writers will take it seriously and implement it. Open

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

DapperLib/Dapper#1305 · 19 comments · Opened Aug 10, 2019
Postgres type cast is interpreted as parameter Open

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

DapperLib/Dapper#1299 · Opened Jul 25, 2019
Fix 'ITypeHandler' 'SetValue' method can't intercept 'ValueType' and 'String' type Open

Difficulty 4/5 3-5 days Newbie friendliness 32/100

DapperLib/Dapper#1298 · 1 comment · Opened Jul 23, 2019
V2 API refactors Open

area:api breaking-change v3.0

DapperLib/Dapper#1293 · 10 comments · 29 reactions · 1 assignee · Opened Jul 11, 2019
SqlMapper.TypeHandler SetValue Function No Execute Open

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

DapperLib/Dapper#1290 · 8 reactions · Opened Jul 2, 2019
Dapper try to find Int32 parameters construtor when query returns no row Open

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

DapperLib/Dapper#1275 · Opened Jun 10, 2019

DapperLib/Dapper

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