private Expression JoinWhereMethod(Expression node)
{
while (node.NodeType == ExpressionType.Call && node is MethodCallExpression methodCall)
{
if (methodCall.Method.Name == MethodCall.From)
{
throw new DSyntaxErrorException($"在连接函数中，禁止使用“{methodCall.Method.Name}”函数!");
}
if (methodCall.Method.Name == MethodCall.Where)
{
Workflow(whereIsNotEmpty =>
{
if (whereIsNotEmpty)
{
writer.And();
}
}, () =>
{
using (var visitor = new WhereVisitor(this))
{
visitor.Startup(methodCall.Arguments[1]);
}
});
node = methodCall.Arguments[0];
continue;
}
break;
}
return(node);
}
/// <summary>
/// 条件。
/// </summary>
protected virtual void VisitIsBoolean(Expression node)
{
using (var visitor = new WhereVisitor(this))
{
visitor.Startup(node);
}
}
/// <summary>
/// 条件。
/// </summary>
/// <param name="node">节点。</param>
/// <returns></returns>
protected override internal void VisitCondition(MethodCallExpression node)
{
if (node.Arguments[0].NodeType == ExpressionType.Parameter)
{
using (var visitor = new WhereVisitor(this))
{
visitor.Startup(node.Arguments[1]);
}
}
else
{
base.VisitCondition(node);
}
}
