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[英]No coercion operator is defined between types 'System.String' and 'System.Nullable`1[System.DateTime]'
[英]No coercion operator is defined between types Microsoft.OData.Edm.Date and System.Nullable System.DateTimeOffset
我们正在构建一个odata webservice并面临转换问题。
使用以下odata查询网址:
"http://some.url.ext/test/endPoint?$filter=SomeDate ge 1990-01-01"
在我们的odata-filtered枚举中,SomeDate是Nullable<DateTime> DateTime?
。
然而,看起来odata控制器在Nullable<DateTimeOffset> DateTimeOffset?
然后抱怨它无法比较Microsoft.OData.Edm.Date
和System.Nullable System.DateTimeOffset
错误是:
URI中指定的查询无效。 类型'Microsoft.OData.Edm.Date'和'System.Nullable`1 [System.DateTimeOffset]'之间没有定义强制运算符。
No coercion operator is defined between types 'Microsoft.OData.Edm.Date' and 'System.Nullable`1[System.DateTimeOffset]'.
System.InvalidOperationException at System.Linq.Expressions.Expression.GetUserDefinedCoercionOrThrow(ExpressionType coercionType, Expression expression, Type convertToType)
at System.Linq.Expressions.Expression.Convert(Expression expression, Type type, MethodInfo method)
at System.Web.OData.Query.Expressions.ExpressionBinderBase.CreateConvertExpression(ConvertNode convertNode, Expression source)
at System.Web.OData.Query.Expressions.FilterBinder.BindConvertNode(ConvertNode convertNode)
at System.Web.OData.Query.Expressions.FilterBinder.Bind(QueryNode node)
at System.Web.OData.Query.Expressions.FilterBinder.BindBinaryOperatorNode(BinaryOperatorNode binaryOperatorNode)
at System.Web.OData.Query.Expressions.FilterBinder.Bind(QueryNode node)
at System.Web.OData.Query.Expressions.FilterBinder.BindExpression(SingleValueNode expression, RangeVariable rangeVariable, Type elementType)
at System.Web.OData.Query.Expressions.FilterBinder.BindFilterClause(FilterBinder binder, FilterClause filterClause, Type filterType)
at System.Web.OData.Query.Expressions.FilterBinder.Bind(FilterClause filterClause, Type filterType, IServiceProvider requestContainer)
at System.Web.OData.Query.FilterQueryOption.ApplyTo(IQueryable query, ODataQuerySettings querySettings)
at System.Web.OData.Query.ODataQueryOptions.ApplyTo(IQueryable query, ODataQuerySettings querySettings)
at System.Web.OData.EnableQueryAttribute.ApplyQuery(IQueryable queryable, ODataQueryOptions queryOptions)
at System.Web.OData.EnableQueryAttribute.ExecuteQuery(Object response, HttpRequestMessage request, HttpActionDescriptor actionDescriptor, ODataQueryContext queryContext)
at System.Web.OData.EnableQueryAttribute.OnActionExecuted(HttpActionExecutedContext actionExecutedContext)
使用我们的输出数据的IEnumerable调用ODataController.Ok()
方法时会触发错误。
我们正在使用Micrtosoft.Odata.Edm 7.0.0
好的,通过在过滤器中使用DateTimeOffset日期格式来解决它! 只需使用如下:
"http://some.url.ext/test/endPoint?$filter=SomeDate ge 1990-01-01T00:00:00Z"
希望这可以帮助
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