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plurals

POAppend to an expression
primarykey
Id
2231302
data
AcceptedAnswerId
0
AnswerCount
4
ClosedDate
CommentCount
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CommunityOwnedDate
CreationDate
2010-02-09T18:06:59.117
FavoriteCount
6
LastActivityDate
2016-09-08T21:52:51.857
LastEditDate
2017-05-23T12:25:36.213
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38230
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Score
12
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7000
LastEditorDisplayName
text
Body
I followed this thread: <a href="https://stackoverflow.com/questions/1266742/append-to-an-expression-linq-c">link text</a> Jason gives an example: <pre><code>public static Expression<TDelegate> AndAlso<TDelegate>(this Expression<TDelegate> left, Expression<TDelegate> right) { return Expression.Lambda<TDelegate>(Expression.AndAlso(left, right), left.Parameters); } </code></pre> and its usage as such: <pre><code>Expression<Func<Client, bool>> clientWhere = c => true; if (filterByClientFName) { clientWhere = clientWhere.AndAlso(c => c.ClientFName == searchForClientFName); } if (filterByClientLName) { clientWhere = clientWhere.AndAlso(c => c.ClientLName == searchForClientLName); } </code></pre> I have a orders table and i followed the above example, changing column names, and i get the similar error that the post creator had <blockquote> The binary operator AndAlso is not defined for the types 'System.Func<code>2[Models.Order,System.Boolean]' and 'System.Func</code>2[Models.Order,System.Boolean]'. </blockquote> Anyone have any thoughts on what I am missing? UPDATED: Eric, I further followed what the user of the previous post was asking, here <a href="https://stackoverflow.com/questions/1263565/dynamic-join-in-linq-0-c">link text</a> The user has this <pre><code>Expression<Func<Client, bool>> clientWhere = c => true; Expression<Func<Order, bool>> orderWhere = o => true; Expression<Func<Product, bool>> productWhere = p => true; if (filterByClient) { clientWhere = c => c.ClientID == searchForClientID; } </code></pre> Now if he were to have various conditions in <code>filterByClient</code>, say he either has <code>clientid</code> and/or some other column name, how would one build the <code>clientWhere</code> expression?
Tags
<c#><linq>
Title
Append to an expression
singulars
PostAcceptedAnswerId
1. This table or related slice is empty.
PostParentId
1. This table or related slice is empty.
PostTypePostTypeId
1. PTQuestion
UserLastEditorUserId
1. USCommunity
UserOwnerUserId
1. USuser38230
plurals
PostLinksPostIdRelatedPostId
1. PL
 singulars
 LinkTypeLinkTypeId
 LTLinked
2. PL
 singulars
 LinkTypeLinkTypeId
 LTLinked
3. PL
 singulars
 LinkTypeLinkTypeId
 LTLinked
PostLinksRelatedPostIdPostId
1. PL
 singulars
 LinkTypeLinkTypeId
 LTLinked
PostsAcceptedAnswerId
1. This table or related slice is empty.
PostsParentIdCreationDate
1. PO
 singulars
 PostTypePostTypeId
 PTAnswer
2. PO
 singulars
 PostTypePostTypeId
 PTAnswer
3. PO
 singulars
 PostTypePostTypeId
 PTAnswer
VotesPostIdCreationDate
1. VO
 singulars
 PostPostId
 POAppend to an expression
 UserUserId
 USEric Lippert
 VoteTypeVoteTypeId
 VTFavorite
2. VO
 singulars
 PostPostId
 POAppend to an expression
 UserUserId
 This table or related slice is empty.
 VoteTypeVoteTypeId
 VTUpMod
3. VO
 singulars
 PostPostId
 POAppend to an expression
 UserUserId
 USsala91
 VoteTypeVoteTypeId
 VTFavorite
CommentsPostId
1. This table or related slice is empty.

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