使用实体框架4.1将位字段参数传递给存储过程

全部，

我一整天都被下列问题困扰着。我正在尝试进行一个包含三位字段参数的参数化存储过程调用。我经常遇到的异常是"将数据类型nvarchar转换为位时出错。"

这是我的源代码：

存储过程

ALTER PROCEDURE usp_TestParamProc
    @price_segment_set_id VARCHAR(8) = NULL,
    @segment_group_id VARCHAR(8) = NULL,
    @segment_price_band_id VARCHAR(8) = NULL,
    @segment_id VARCHAR(8) = NULL,
    @include_source_price_bands BIT = 0,
    @apply_segmentation BIT = 0,
    @print_sql BIT = 0
AS
BEGIN
    SET NOCOUNT ON;
    SELECT *
    FROM MarketingSegmentDetails
    WHERE SegmentID = @segment_id
END
GO

---

C#代码：

        var segment_id = "1";
        string segment_group_id = "1";
        string segment_price_band_id = "1";
        string price_segment_set_id = "1";
        var include_source_price_bands = false;
        var apply_segmentation = false;
        var print_sql = false;
        using (var context = new PricingContext())
        {
            var list = new List<object>();
            list.Add(price_segment_set_id == null
                         ? new SqlParameter("price_segment_set_id", DBNull.Value)
                         : new SqlParameter("price_segment_set_id", price_segment_set_id));
            list.Add(segment_group_id == null
                        ? new SqlParameter("segment_group_id", DBNull.Value)
                        : new SqlParameter("segment_group_id", segment_group_id));
            list.Add(segment_price_band_id == null
                        ? new SqlParameter("segment_price_band_id", DBNull.Value)
                        : new SqlParameter("segment_price_band_id", segment_price_band_id));
            list.Add(segment_id == null
                        ? new SqlParameter("segment_id", DBNull.Value)
                        : new SqlParameter("segment_Id", segment_id));
            list.Add(include_source_price_bands == null 
                        ? new SqlParameter("include_source_price_bands", DBNull.Value)
                        : new SqlParameter("include_source_price_bands", Convert.ToBoolean(include_source_price_bands)));
            list.Add(apply_segmentation == null
                        ? new SqlParameter("apply_segmentation", DBNull.Value)
                        : new SqlParameter("apply_segmentation", Convert.ToBoolean(apply_segmentation)));
            list.Add(print_sql == null
                         ? new SqlParameter("print_sql", DBNull.Value)
                         : new SqlParameter("print_sql", Convert.ToBoolean(print_sql)));
            var segments = context.Database.SqlQuery<usp_SegmentProcessing>("usp_TestParamProc price_segment_set_id, segment_group_id, segment_price_band_id, segment_id, include_source_price_bands, apply_segmentation, print_sql", list.ToArray()).ToList();

如有任何帮助，我们将不胜感激。我在项目工作上落后了。

谢谢，Derek

list.Add(
   new SqlParameter("print_sql", System.Data.SqlDbType.Bit) { Value = (print_sql != null ? print_sql : DBNull.Value) }
);