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
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Beginner friendly Everything

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466 open issues indexed

QueryFirst<> Ignores SQL Error Open

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

DapperLib/Dapper#1834 · 3 comments · Opened Oct 4, 2022
TypeHandler Override -> SetValue not being called. Open

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

DapperLib/Dapper#1831 · 4 comments · Opened Sep 30, 2022
looping over dynamic parameters and getting parameter direction Open

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

DapperLib/Dapper#1829 · Opened Sep 28, 2022
Handle NaN value in Numeric field Open

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

DapperLib/Dapper#1828 · Opened Sep 27, 2022
Conversion overflows error appear after the decimal point decimal(38,12) Open

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

DapperLib/Dapper#1827 · Opened Sep 26, 2022
Unable to mapped underscore column in dapper extension Open

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

DapperLib/Dapper#1825 · 3 comments · Opened Sep 23, 2022
Concurrent Problem For Help Open

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

DapperLib/Dapper#1823 · Opened Sep 7, 2022
IDataReader.GetRowParser<string>() throws exception Open

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

DapperLib/Dapper#1822 · 3 comments · 2 reactions · Opened Sep 6, 2022
The reader has been disposed with version 2.0.123 Open

Difficulty 4/5 3-5 days Newbie friendliness 18/100

DapperLib/Dapper#1821 · 4 comments · Opened Sep 2, 2022
with string > 4000 characters fails against DM8（达梦数据库） Open

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

DapperLib/Dapper#1820 · 1 comment · Opened Sep 2, 2022
Invalid SQL for "WHERE ... IN" with parentheses Open

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

DapperLib/Dapper#1819 · 8 comments · Opened Aug 31, 2022
SqlMapper Query param empty list cause table scan in mysql Open

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

DapperLib/Dapper#1818 · 2 comments · 2 reactions · Opened Aug 19, 2022
Using dapper with snowflake connection Open

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

DapperLib/Dapper#1814 · 1 reaction · Opened Aug 5, 2022
How to work with c# record type? Open

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

DapperLib/Dapper#1813 · Opened Aug 4, 2022
SqlMapper.LookupDbType Open

Difficulty 1/5 Under an hour Newbie friendliness 45/100

DapperLib/Dapper#1811 · Opened Jul 28, 2022
One to Many relationship - Mapping through reflection Open

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

DapperLib/Dapper#1808 · 1 comment · Opened Jul 25, 2022
ApplyNullValues behaviour with nullable types/nullable reference types Open

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

DapperLib/Dapper#1807 · 1 comment · 1 reaction · Opened Jul 23, 2022
Does this work with the snowflake dotnet core connector? Open

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

DapperLib/Dapper#1803 · 1 comment · Opened Jul 11, 2022
Proposal: Add Support for Loosely Coupled Custom Query Parameter Open

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

DapperLib/Dapper#1798 · Opened Jul 5, 2022
Dapper.Rainbow uses DbConnection on Init instead of IDbConnection Open

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

DapperLib/Dapper#1796 · Opened Jul 4, 2022
Explicitly implemented ICustomQueryParameter fails with an ArgumentNullException Open

Difficulty 2/5 1-3 hours Newbie friendliness 55/100

DapperLib/Dapper#1793 · 1 comment · Opened Jul 1, 2022
Mapping '-infinity' to DateTimeOffset fails when used with Npgsql Open

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

DapperLib/Dapper#1791 · 2 comments · Opened Jun 29, 2022
Null Ref Exception when using splitOn Open

Difficulty 4/5 3-5 days Newbie friendliness 28/100

DapperLib/Dapper#1790 · Opened Jun 27, 2022
Veracode reports SQL Injection | CWE 89 Open

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

DapperLib/Dapper#1789 · 1 comment · 2 reactions · Opened Jun 22, 2022
DynamicParameters works with DbString but not with IEnumerable<DbString> Open

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

DapperLib/Dapper#1787 · 1 comment · 3 reactions · Opened Jun 17, 2022
postgresql where .. in error Open

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

DapperLib/Dapper#1785 · 4 comments · Opened Jun 15, 2022
get bool value in code from bit return value Open

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

DapperLib/Dapper#1779 · 2 comments · Opened May 28, 2022
Rainbow table doesn't support IDs of type long Open

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

DapperLib/Dapper#1777 · 1 comment · Opened May 12, 2022
Minor documentation bug with anonymous types & parameters Open

Difficulty 1/5 Under an hour Newbie friendliness 78/100

DapperLib/Dapper#1775 · Opened Apr 20, 2022
Dapper With Geography Open

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

DapperLib/Dapper#1774 · 3 comments · Opened Apr 20, 2022
performance issue Open

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

DapperLib/Dapper#1772 · Opened Apr 11, 2022
Do we plan to support the gerenate the SQL text per the Domain object? Open

Difficulty 5/5 Over a week Newbie friendliness 18/100

DapperLib/Dapper#1771 · Opened Apr 4, 2022
Some strings can be cast as decimals and cause an overflow error Open

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

DapperLib/Dapper#1769 · 2 comments · 1 reaction · Opened Mar 31, 2022
"param11" replace "param1" Open

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

DapperLib/Dapper#1768 · 5 comments · Opened Mar 31, 2022
Wrong GridIndex for Identity Open

Difficulty 1/5 Under an hour Newbie friendliness 35/100

DapperLib/Dapper#1766 · 1 comment · Opened Mar 24, 2022
Mapping does not work properly Open

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

DapperLib/Dapper#1765 · Opened Mar 23, 2022
QueryAsync<T> 性能 Open

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

DapperLib/Dapper#1764 · 7 comments · Opened Mar 22, 2022
ODBC query with parameter throws "[HY104] invalid precision value" Open

Difficulty 3/5 1-2 days Newbie friendliness 28/100

DapperLib/Dapper#1761 · 1 comment · Opened Mar 17, 2022
GetColumnHash throws: Object reference not set to an instance of an object. Open

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

DapperLib/Dapper#1760 · 1 comment · Opened Mar 16, 2022
Broken type mapping on nullable structs (discovered for npgsql) Open

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

DapperLib/Dapper#1755 · 4 comments · 2 reactions · Opened Feb 9, 2022
Ability to handle nulls in a custom type handler Open

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

DapperLib/Dapper#1754 · 2 comments · 1 reaction · Opened Feb 8, 2022
Mapping of the sbyte C# type is invalid for Npgsql / Postgres Open

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

DapperLib/Dapper#1747 · 2 comments · Opened Jan 25, 2022
Multi-mapping depends on order of columns Open

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

DapperLib/Dapper#1746 · 1 comment · Opened Jan 20, 2022
Dapper.Contrib StrongName Open

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

DapperLib/Dapper#1745 · Opened Jan 13, 2022
Update command timeout (and all time-based parameters) to TimeSpan Open

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

DapperLib/Dapper#1744 · Opened Jan 5, 2022
Use source generators instead of reflection Open

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

DapperLib/Dapper#1743 · 2 comments · 2 reactions · Opened Jan 5, 2022
One to One mapping and join two condition, how to set splitOn Open

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

DapperLib/Dapper#1742 · 1 comment · Opened Jan 4, 2022
while using QueryFirstOrDefaultAsync without Using block ,getting wrong result in output Open

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

DapperLib/Dapper#1740 · 8 comments · Opened Dec 30, 2021
Deserialize postgres jsonb to JObject Open

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

DapperLib/Dapper#1734 · 4 comments · Opened Dec 14, 2021
Is Dapper Support SAP Sql Anywhere Database ? Open

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

DapperLib/Dapper#1733 · 6 comments · Opened Dec 14, 2021

DapperLib/Dapper

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