Can not instantiate proxy of class: Microsoft.EntityFrameworkCore.ChangeTracking.EntityEntry

.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty{ height:90px;width:728px;box-sizing:border-box;
}

I have a method in my repo that calls datacontext.Add method and return resutl.Entity like:

 var result =  _dataContext.Product.Add(product);

 await _dataContext.SaveChangesAsync();

 return result.Entity;

Now I want to create mock for EntityEntry<Product> but I am getting an exception:

Message: Castle.DynamicProxy.InvalidProxyConstructorArgumentsException
: Can not instantiate proxy of class:
Microsoft.EntityFrameworkCore.ChangeTracking.EntityEntry`1[[Product,
Product.Entities, Version=1.0.0.0, Culture=neutral,
PublicKeyToken=null]]. Could not find a parameterless constructor.

Here is my Test Method code:

 var productMock = new Mock<EntityEntry<Product>>();

 var entity = new Product{Id = 1, Name = "Bag"};

 mappingMock.Setup(m => m.Entity).Returns(entity);

 var dataContextMock = new Mock<DataContext>(_options);

 var productMockSet = new Mock<DbSet<Product>>();

 dataContextMock.Setup(a => a.Product)

     .Returns(productMockSet.Object);

 dataContextMock.Setup(m => m.Product.Add(It.IsAny<Product>())).Returns(productMock.Object);

What am I doing wrong? or is there any other way to Assert EntityEntry?

asked Nov 16 '18 at 13:53

Ask

306315

That class has no parameterless constructor as stated by the error docs.microsoft.com/en-us/ef/core/api/…

– Nkosi
Nov 16 '18 at 13:56

Note also This API supports the Entity Framework Core infrastructure and is not intended to be used directly from your code. This API may change or be removed in future releases.

– Nkosi
Nov 16 '18 at 13:57

Trying to mock EF can be task. Consider using in-memory database

– Nkosi
Nov 16 '18 at 13:58

1

What am I doing wrong? You are trying to integration test an external framework/library. That's not your task, EF Core has been tested by Microsoft. You should test against your own code. For integration tests, use in-memory as Nkosi said. For Unit Tests, better abstract your code. You should mock your repository, not EF Core in unit tests

– Tseng
Nov 16 '18 at 14:18

Then how can I Assert my method?

– Ask
Nov 19 '18 at 9:33

add a comment |

I have a method in my repo that calls datacontext.Add method and return resutl.Entity like:

 var result =  _dataContext.Product.Add(product);

 await _dataContext.SaveChangesAsync();

 return result.Entity;

Now I want to create mock for EntityEntry<Product> but I am getting an exception:

Message: Castle.DynamicProxy.InvalidProxyConstructorArgumentsException
: Can not instantiate proxy of class:
Microsoft.EntityFrameworkCore.ChangeTracking.EntityEntry`1[[Product,
Product.Entities, Version=1.0.0.0, Culture=neutral,
PublicKeyToken=null]]. Could not find a parameterless constructor.

Here is my Test Method code:

 var productMock = new Mock<EntityEntry<Product>>();

 var entity = new Product{Id = 1, Name = "Bag"};

 mappingMock.Setup(m => m.Entity).Returns(entity);

 var dataContextMock = new Mock<DataContext>(_options);

 var productMockSet = new Mock<DbSet<Product>>();

 dataContextMock.Setup(a => a.Product)

     .Returns(productMockSet.Object);

 dataContextMock.Setup(m => m.Product.Add(It.IsAny<Product>())).Returns(productMock.Object);

What am I doing wrong? or is there any other way to Assert EntityEntry?

asked Nov 16 '18 at 13:53

Ask

306315

That class has no parameterless constructor as stated by the error docs.microsoft.com/en-us/ef/core/api/…

– Nkosi
Nov 16 '18 at 13:56

Note also This API supports the Entity Framework Core infrastructure and is not intended to be used directly from your code. This API may change or be removed in future releases.

– Nkosi
Nov 16 '18 at 13:57

Trying to mock EF can be task. Consider using in-memory database

– Nkosi
Nov 16 '18 at 13:58

1

What am I doing wrong? You are trying to integration test an external framework/library. That's not your task, EF Core has been tested by Microsoft. You should test against your own code. For integration tests, use in-memory as Nkosi said. For Unit Tests, better abstract your code. You should mock your repository, not EF Core in unit tests

– Tseng
Nov 16 '18 at 14:18

Then how can I Assert my method?

– Ask
Nov 19 '18 at 9:33

add a comment |

I have a method in my repo that calls datacontext.Add method and return resutl.Entity like:

 var result =  _dataContext.Product.Add(product);

 await _dataContext.SaveChangesAsync();

 return result.Entity;

Now I want to create mock for EntityEntry<Product> but I am getting an exception:

Message: Castle.DynamicProxy.InvalidProxyConstructorArgumentsException
: Can not instantiate proxy of class:
Microsoft.EntityFrameworkCore.ChangeTracking.EntityEntry`1[[Product,
Product.Entities, Version=1.0.0.0, Culture=neutral,
PublicKeyToken=null]]. Could not find a parameterless constructor.

Here is my Test Method code:

 var productMock = new Mock<EntityEntry<Product>>();

 var entity = new Product{Id = 1, Name = "Bag"};

 mappingMock.Setup(m => m.Entity).Returns(entity);

 var dataContextMock = new Mock<DataContext>(_options);

 var productMockSet = new Mock<DbSet<Product>>();

 dataContextMock.Setup(a => a.Product)

     .Returns(productMockSet.Object);

 dataContextMock.Setup(m => m.Product.Add(It.IsAny<Product>())).Returns(productMock.Object);

What am I doing wrong? or is there any other way to Assert EntityEntry?

asked Nov 16 '18 at 13:53

Ask

306315

I have a method in my repo that calls datacontext.Add method and return resutl.Entity like:

 var result =  _dataContext.Product.Add(product);

 await _dataContext.SaveChangesAsync();

 return result.Entity;

Now I want to create mock for EntityEntry<Product> but I am getting an exception:

Message: Castle.DynamicProxy.InvalidProxyConstructorArgumentsException
: Can not instantiate proxy of class:
Microsoft.EntityFrameworkCore.ChangeTracking.EntityEntry`1[[Product,
Product.Entities, Version=1.0.0.0, Culture=neutral,
PublicKeyToken=null]]. Could not find a parameterless constructor.

Here is my Test Method code:

 var productMock = new Mock<EntityEntry<Product>>();

 var entity = new Product{Id = 1, Name = "Bag"};

 mappingMock.Setup(m => m.Entity).Returns(entity);

 var dataContextMock = new Mock<DataContext>(_options);

 var productMockSet = new Mock<DbSet<Product>>();

 dataContextMock.Setup(a => a.Product)

     .Returns(productMockSet.Object);

 dataContextMock.Setup(m => m.Product.Add(It.IsAny<Product>())).Returns(productMock.Object);

What am I doing wrong? or is there any other way to Assert EntityEntry?

.net unit-testing asp.net-core moq

asked Nov 16 '18 at 13:53

Ask

306315

asked Nov 16 '18 at 13:53

Ask

306315

asked Nov 16 '18 at 13:53

Ask

306315

asked Nov 16 '18 at 13:53

Ask

306315

asked Nov 16 '18 at 13:53

Ask

306315

That class has no parameterless constructor as stated by the error docs.microsoft.com/en-us/ef/core/api/…

– Nkosi
Nov 16 '18 at 13:56

Note also This API supports the Entity Framework Core infrastructure and is not intended to be used directly from your code. This API may change or be removed in future releases.

– Nkosi
Nov 16 '18 at 13:57

Trying to mock EF can be task. Consider using in-memory database

– Nkosi
Nov 16 '18 at 13:58

1

What am I doing wrong? You are trying to integration test an external framework/library. That's not your task, EF Core has been tested by Microsoft. You should test against your own code. For integration tests, use in-memory as Nkosi said. For Unit Tests, better abstract your code. You should mock your repository, not EF Core in unit tests

– Tseng
Nov 16 '18 at 14:18

Then how can I Assert my method?

– Ask
Nov 19 '18 at 9:33

add a comment |

That class has no parameterless constructor as stated by the error docs.microsoft.com/en-us/ef/core/api/…

– Nkosi
Nov 16 '18 at 13:56

Note also This API supports the Entity Framework Core infrastructure and is not intended to be used directly from your code. This API may change or be removed in future releases.

– Nkosi
Nov 16 '18 at 13:57

Trying to mock EF can be task. Consider using in-memory database

– Nkosi
Nov 16 '18 at 13:58

1

What am I doing wrong? You are trying to integration test an external framework/library. That's not your task, EF Core has been tested by Microsoft. You should test against your own code. For integration tests, use in-memory as Nkosi said. For Unit Tests, better abstract your code. You should mock your repository, not EF Core in unit tests

– Tseng
Nov 16 '18 at 14:18

Then how can I Assert my method?

– Ask
Nov 19 '18 at 9:33

That class has no parameterless constructor as stated by the error docs.microsoft.com/en-us/ef/core/api/…

– Nkosi
Nov 16 '18 at 13:56

Note also

This API supports the Entity Framework Core infrastructure and is not intended to be used directly from your code. This API may change or be removed in future releases.

– Nkosi
Nov 16 '18 at 13:57

Note also

This API supports the Entity Framework Core infrastructure and is not intended to be used directly from your code. This API may change or be removed in future releases.

– Nkosi
Nov 16 '18 at 13:57

Trying to mock EF can be task. Consider using in-memory database

– Nkosi
Nov 16 '18 at 13:58

What am I doing wrong? You are trying to integration test an external framework/library. That's not your task, EF Core has been tested by Microsoft. You should test against your own code. For integration tests, use in-memory as Nkosi said. For Unit Tests, better abstract your code. You should mock your repository, not EF Core in unit tests

– Tseng
Nov 16 '18 at 14:18

Then how can I Assert my method?

– Ask
Nov 19 '18 at 9:33

add a comment |

1 Answer
1

active

oldest

votes

I think you are missing these mocking objects:

var iStateManager = new Mock<IStateManager>();

var model = new Mock<Model>();



var productEntityEntry = new Mock<EntityEntry<Product>>(

new InternalShadowEntityEntry(iStateManager.Object, new EntityType("Product", model.Object, ConfigurationSource.Convention)));



productEntityEntry.SetupGet(m=> m.Entity).Returns(entity);

answered Jan 15 at 10:18

Karina

add a comment |

Your Answer

StackExchange.ifUsing("editor", function () {
StackExchange.using("externalEditor", function () {
StackExchange.using("snippets", function () {
StackExchange.snippets.init();
});
});
}, "code-snippets");

StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);

StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});

function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});

}
});

draft saved

draft discarded

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Post as a guest

Name

Required, but never shown

StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53339226%2fcan-not-instantiate-proxy-of-class-microsoft-entityframeworkcore-changetracking%23new-answer', 'question_page');
}
);

Post as a guest

Name

Required, but never shown

1 Answer
1

active

oldest

votes

1 Answer
1

active

oldest

votes

I think you are missing these mocking objects:

var iStateManager = new Mock<IStateManager>();

var model = new Mock<Model>();



var productEntityEntry = new Mock<EntityEntry<Product>>(

new InternalShadowEntityEntry(iStateManager.Object, new EntityType("Product", model.Object, ConfigurationSource.Convention)));



productEntityEntry.SetupGet(m=> m.Entity).Returns(entity);

answered Jan 15 at 10:18

Karina

add a comment |

I think you are missing these mocking objects:

var iStateManager = new Mock<IStateManager>();

var model = new Mock<Model>();



var productEntityEntry = new Mock<EntityEntry<Product>>(

new InternalShadowEntityEntry(iStateManager.Object, new EntityType("Product", model.Object, ConfigurationSource.Convention)));



productEntityEntry.SetupGet(m=> m.Entity).Returns(entity);

answered Jan 15 at 10:18

Karina

add a comment |

I think you are missing these mocking objects:

var iStateManager = new Mock<IStateManager>();

var model = new Mock<Model>();



var productEntityEntry = new Mock<EntityEntry<Product>>(

new InternalShadowEntityEntry(iStateManager.Object, new EntityType("Product", model.Object, ConfigurationSource.Convention)));



productEntityEntry.SetupGet(m=> m.Entity).Returns(entity);

answered Jan 15 at 10:18

Karina

I think you are missing these mocking objects:

var iStateManager = new Mock<IStateManager>();

var model = new Mock<Model>();



var productEntityEntry = new Mock<EntityEntry<Product>>(

new InternalShadowEntityEntry(iStateManager.Object, new EntityType("Product", model.Object, ConfigurationSource.Convention)));



productEntityEntry.SetupGet(m=> m.Entity).Returns(entity);

answered Jan 15 at 10:18

Karina

answered Jan 15 at 10:18

Karina

answered Jan 15 at 10:18

Karina

answered Jan 15 at 10:18

Karina

add a comment |

draft saved

draft discarded

Thanks for contributing an answer to Stack Overflow!

Please be sure to answer the question. Provide details and share your research!

But avoid …

Asking for help, clarification, or responding to other answers.

Making statements based on opinion; back them up with references or personal experience.

To learn more, see our tips on writing great answers.

draft saved

draft discarded

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Post as a guest

Name

Required, but never shown

Post as a guest

Name

Required, but never shown

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Post as a guest

Name

Required, but never shown

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Post as a guest

Name

Required, but never shown

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Post as a guest

Name

Required, but never shown

Name

Required, but never shown

Name

Required, but never shown

This page is only for reference, If you need detailed information, please check here

搜尋此網誌

Vfrdtyky