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Slowness when using large number of dynamic parameters. Fixes #1537 #2037

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Slowness when using large number of dynamic parameters. Fixes #1537 #2037

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8 changes: 7 additions & 1 deletion Dapper/DynamicParameters.cs
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Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
using System;
using System.Collections.Generic;
using System.Data;
using System.Globalization;
using System.Linq;
using System.Linq.Expressions;
using System.Reflection;
Expand Down Expand Up @@ -222,6 +223,9 @@ protected void AddParameters(IDbCommand command, SqlMapper.Identity identity)
}
}

HashSet<string> addedParameters = new HashSet<string>(command.Parameters.Cast<IDbDataParameter>()
.Select(x => x.ParameterName), comparer: StringComparer.CurrentCultureIgnoreCase);

foreach (var param in parameters.Values)
{
if (param.CameFromTemplate) continue;
Expand Down Expand Up @@ -250,7 +254,7 @@ protected void AddParameters(IDbCommand command, SqlMapper.Identity identity)
}
else
{
bool add = !command.Parameters.Contains(name);
bool add = !addedParameters.Contains(name);
IDbDataParameter p;
if (add)
{
Expand Down Expand Up @@ -296,6 +300,8 @@ protected void AddParameters(IDbCommand command, SqlMapper.Identity identity)
}
param.AttachedParam = p;
}

addedParameters.Add(name);
}

// note: most non-privileged implementations would use: this.ReplaceLiterals(command);
Expand Down