/// <summary>
/// Translate an expression tree into a compiled OData query.
/// </summary>
/// <param name="expression">The expression tree to translate</param>
/// <param name="contractResolver">The contract resolvers to use to determine property names from members used with expressions.</param>
/// <returns>An OData <see cref="QueryNode"/></returns>
internal static QueryNode Compile(Expression expression, DatasyncContractResolver contractResolver)
{
var visitor = new FilterBuildingExpressionVisitor(contractResolver);
visitor.Visit(expression);
return(visitor.FilterExpression.FirstOrDefault());
}
/// <summary>
/// Gets the table member name referenced by an expression, or return null.
/// </summary>
/// <param name="expression">The expression to check</param>
/// <param name="contractResolver">The contract resolvers to use to determine property names from members used with expressions.</param>
/// <returns>the table member name</returns>
internal static string GetTableMemberName(Expression expression, DatasyncContractResolver contractResolver)
{
Arguments.IsNotNull(expression, nameof(expression));
Arguments.IsNotNull(contractResolver, nameof(contractResolver));
if (expression is MemberExpression member && member.Expression.NodeType == ExpressionType.Parameter)
{
JsonProperty property = contractResolver.ResolveProperty(member.Member);
return(property.PropertyName);
}
return(null);
}
public DatasyncSerializerSettings_Tests()
{
settings = new();
contractResolver = settings.ContractResolver;
}
/// <summary>
/// Initializes a new instance of the <see cref="FilterBuildingExpressionVisitor"/>
/// </summary>
/// <param name="contractResolver">The contract resolvers to use to determine property names from members used with expressions.</param>
internal FilterBuildingExpressionVisitor(DatasyncContractResolver contractResolver) : base()
{
Arguments.IsNotNull(contractResolver, nameof(contractResolver));
ContractResolver = contractResolver;
}