Dapper/Dapper.ProviderTools/DbExceptionExtensions.cs at main · DapperLib/Dapper · GitHub

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using System;

using System.Collections.Concurrent;

using System.Data.Common;

using System.Linq.Expressions;

using System.Reflection;

namespace Dapper.ProviderTools

{

/// <summary>

/// Helper utilities for working with database exceptions

/// </summary>

public static class DbExceptionExtensions

{

/// <summary>

/// Indicates whether the provided exception has an integer Number property with the supplied value

/// </summary>

public static bool IsNumber(this DbException exception, int number)

=> exception is not null && ByTypeHelpers.Get(exception.GetType()).IsNumber(exception, number);

private sealed class ByTypeHelpers

{

private static readonly ConcurrentDictionary<Type, ByTypeHelpers> s_byType

= new ConcurrentDictionary<Type, ByTypeHelpers>();

private readonly Func<DbException, int>? _getNumber;

public bool IsNumber(DbException exception, int number)

=> _getNumber is not null && _getNumber(exception) == number;

public static ByTypeHelpers Get(Type type)

{

if (!s_byType.TryGetValue(type, out var value))

{

s_byType[type] = value = new ByTypeHelpers(type);

}

return value;

}

private ByTypeHelpers(Type type)

{

_getNumber = TryGetInstanceProperty<int>("Number", type);

}

private static Func<DbException, T>? TryGetInstanceProperty<T>(string name, Type type)

{

try

{

var prop = type.GetProperty(name, BindingFlags.Public | BindingFlags.Instance);

if (prop is null || !prop.CanRead) return null;

if (prop.PropertyType != typeof(T)) return null;

var p = Expression.Parameter(typeof(DbException), "exception");

var body = Expression.Property(Expression.Convert(p, type), prop);

var lambda = Expression.Lambda<Func<DbException, T>>(body, p);

return lambda.Compile();

}

catch

{

return null;

}

Dapper/Dapper.ProviderTools/DbExceptionExtensions.cs at main · DapperLib/Dapper · GitHub

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Dapper/Dapper.ProviderTools/DbExceptionExtensions.cs at main · DapperLib/Dapper · GitHub

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