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

Runtime error when using DateOnly Open

blocked:external feature request

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

DapperLib/Dapper#1728 · 33 comments · 15 reactions · Opened Nov 21, 2021
Does Dapper support .NET 6? Open

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

DapperLib/Dapper#1727 · 7 comments · Opened Nov 15, 2021
Dapper 2.0.123 broke ExecuteImplAsync string mapping (AnsiString) Open

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

DapperLib/Dapper#1725 · 13 comments · 3 reactions · Opened Nov 4, 2021
Converting a list of a type that needs a TypeHandler Open

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

DapperLib/Dapper#1722 · 1 comment · 1 reaction · Opened Oct 28, 2021
Dapper performance compared to ADO Open

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

DapperLib/Dapper#1719 · 8 comments · Opened Oct 19, 2021
varchar2[1] null does not map to Char ascii value "0" Open

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

DapperLib/Dapper#1717 · 1 reaction · Opened Oct 13, 2021
How can I save the new values in my database Open

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

DapperLib/Dapper#1713 · Opened Oct 2, 2021
Odd behaviour with Execute(Async) and typed IEnumerable<T> Open

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

DapperLib/Dapper#1708 · Opened Sep 23, 2021
Handling negative/invalid Datetimes gracefully Open

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

DapperLib/Dapper#1704 · 1 comment · Opened Sep 16, 2021
When passing Dictionary<string, object> to Dapper, DataTable values are not properly passed to stored proc TVP arguments Open

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

DapperLib/Dapper#1703 · Opened Sep 14, 2021
System.Data.SQLite.SQLiteException: 'SQL logic error no such table: Employee' Open

Difficulty 4/5 3-5 days Newbie friendliness 10/100

DapperLib/Dapper#1702 · 1 comment · Opened Sep 9, 2021
Dapper MultiMapping: Inconsistency when the splitOn column is NULL Open

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

DapperLib/Dapper#1697 · 1 comment · 2 reactions · Opened Aug 19, 2021
SQLite not displaying new columns via app after ADD COLUMN Open

Difficulty 4/5 3-5 days Newbie friendliness 15/100

DapperLib/Dapper#1694 · 2 comments · Opened Aug 7, 2021
Complex object Mapping returns null if First column value null Open

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

DapperLib/Dapper#1693 · 2 comments · Opened Aug 6, 2021
DynamicParameters and Snowflake syntax? Open

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

DapperLib/Dapper#1687 · 19 comments · Opened Jul 21, 2021
About the SQLMapper addTypeHandler exception Open

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

DapperLib/Dapper#1685 · Opened Jul 17, 2021
Fields of postgres composite type are null when queried directly Open

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

DapperLib/Dapper#1684 · Opened Jul 12, 2021
System.Data.DataException:“Error parsing column 5 (ParentId= - String) Open

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

DapperLib/Dapper#1682 · 2 comments · Opened Jul 9, 2021
Misleading error message when failing to find constructor. Open

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

DapperLib/Dapper#1680 · Opened Jul 7, 2021
QuerySingleOrDefault with SQLite in gives the error “'Must add values for the following parameters” Open

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

DapperLib/Dapper#1678 · 1 comment · Opened Jun 30, 2021
How to use the querymultipleasync call Open

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

DapperLib/Dapper#1677 · 3 comments · Opened Jun 24, 2021
Error when trying to enter a parameter with 90 characters Open

needs-info

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

DapperLib/Dapper#1676 · 4 comments · Opened Jun 23, 2021
Mapping a date field to a string property of record Open

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

DapperLib/Dapper#1670 · 1 comment · Opened Jun 4, 2021
Different TypeHandler for different database types Open

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

DapperLib/Dapper#1668 · 3 comments · 2 reactions · Opened May 13, 2021
Issue mocking(moq) ExecuteAsync for unit test(xunit) Open

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

DapperLib/Dapper#1667 · 4 comments · 1 reaction · Opened May 12, 2021
Announcement: Intent to split Dapper, Dapper.Contrib, and other repositories Open

announcement

DapperLib/Dapper#1658 · 1 comment · 11 reactions · 2 assignees · Opened May 2, 2021
Text column cannot be mapped to nullable enum Open

needs-info

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

DapperLib/Dapper#1653 · 2 comments · Opened Apr 22, 2021
TypeHandlers not called for parameters extracted from list expansion Open

Difficulty 3/5 1-2 days Newbie friendliness 68/100

DapperLib/Dapper#1649 · 3 comments · 10 reactions · Opened Apr 10, 2021
Queryasync method CancellationToken request cancellation, DAPPER will not immediately terminate execution Open

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

DapperLib/Dapper#1640 · 2 comments · 3 reactions · Opened Mar 29, 2021
”where in“ parameter splicing problem Open

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

DapperLib/Dapper#1636 · 2 comments · Opened Mar 15, 2021
Handling object construction Open

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

DapperLib/Dapper#1634 · 1 comment · Opened Mar 12, 2021
In transaction, @@IDENTITY return other table id, is it a bug? Open

db:mysql

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

DapperLib/Dapper#1632 · 10 comments · Opened Mar 8, 2021
Long execution/mapping in QueryMultipleAsync with OFFSET / FETCH Open

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

DapperLib/Dapper#1628 · 3 comments · Opened Feb 20, 2021
Is it possible to have custom object deserialization Open

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

DapperLib/Dapper#1624 · Opened Feb 10, 2021
Duplicate Columns mapping with same name... can you give a look :) Open

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

DapperLib/Dapper#1623 · 4 comments · Opened Feb 8, 2021
Ability to throw when a column is unmapped Open

feature request

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

DapperLib/Dapper#1620 · 1 comment · Opened Feb 4, 2021
MySql In operator throw syntax error Open

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

DapperLib/Dapper#1618 · 3 comments · Opened Feb 3, 2021
Release notes out of date Open

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

DapperLib/Dapper#1613 · 5 comments · 8 reactions · Opened Jan 26, 2021
Can you Implement zero-length results which not provided for Descriptor API for grid binding Open

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

DapperLib/Dapper#1611 · Opened Jan 23, 2021
It is suggested that "sqlbuilder" support dynamic "where"‘ Open

area:sqlbuilder

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

DapperLib/Dapper#1610 · 1 reaction · Opened Jan 16, 2021
Wrong type supplied to custom converter when working with SQLite database Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

DapperLib/Dapper#1607 · Opened Jan 14, 2021
Query with Multiple columns with same name / How to change TypeHandler for Primitive Types Open

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

DapperLib/Dapper#1600 · Opened Dec 23, 2020
Multiple SqlBuilder.Where() calls produce wrong SQL Open

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

DapperLib/Dapper#1599 · 2 comments · 1 reaction · Opened Dec 22, 2020
SqlMaper.MultiMapAsync reads rows synchronously Open

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

DapperLib/Dapper#1594 · 1 reaction · Opened Dec 13, 2020
Dapper OracleMappingType.RefCursor direction: ParameterDirection.Input not working Open

db:oracle

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

DapperLib/Dapper#1592 · 2 comments · Opened Dec 8, 2020
Problem with Table Type Parameter only in Release Mode Open

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

DapperLib/Dapper#1588 · Opened Dec 1, 2020
Add ability to pass additional TypeHandlers to Query methods Open

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

DapperLib/Dapper#1587 · 1 comment · 4 reactions · Opened Dec 1, 2020
QueryMultiple with CommandType.StoredProcedure fails with exception Open

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

DapperLib/Dapper#1580 · 2 comments · Opened Nov 22, 2020
Oracle 10g Blob data Open

db:oracle

Difficulty 1/5 Under an hour Newbie friendliness 15/100

DapperLib/Dapper#1577 · 2 comments · Opened Nov 20, 2020
C# 9 records Open

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

DapperLib/Dapper#1571 · 26 comments · 79 reactions · Opened Nov 16, 2020

DapperLib/Dapper

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