1、新建DecimalPrecisionAttribute.cs

using System;
using System.Collections.Generic;
using System.Data.Entity.ModelConfiguration.Configuration;
using System.Data.Entity.ModelConfiguration.Conventions;
using System.Linq;
using System.Web;

namespace AppBoxMvc.Models
{
    /// <summary>
    /// 精度属性控制
    /// </summary>
    [AttributeUsage(AttributeTargets.Property, Inherited = false, AllowMultiple = false)]
    public sealed class DecimalPrecisionAttribute : Attribute
    {
        #region Field
         private byte _precision = 18;
         public byte _scale = 4;
         #endregion
 
         #region Construct
         /// <summary>
         /// <para>自定义Decimal类型的精确度属性</para>
         /// </summary>
         /// <param name="precision">precision
         /// <para>精度（默认18）</para></param>
         /// <param name="scale">scale
         /// <para>小数位数（默认4）</para></param>
         public DecimalPrecisionAttribute(byte precision = 18, byte scale = 4)
         {
             Precision = precision;
             Scale = scale;
         } 
         #endregion
         
         #region Property
         /// <summary>
         /// 精确度（默认18）
         /// </summary>
         public byte Precision
         {
             get { return this._precision; }
             set { this._precision = value; }
         }
 
         /// <summary>
         /// 保留位数（默认4）
         /// </summary>
         public byte Scale
         {
             get { return this._scale; }
             set { this._scale = value; }
         } 
         #endregion
     }
 
     /// <summary>
     /// 用于modelBuilder全局设置自定义精度属性
     /// </summary>
     public class DecimalPrecisionAttributeConvention
         : PrimitivePropertyAttributeConfigurationConvention<DecimalPrecisionAttribute>
     {
         public override void Apply(ConventionPrimitivePropertyConfiguration configuration, DecimalPrecisionAttribute attribute)
         {
             if (attribute.Precision < 1 || attribute.Precision > 38)
             {
                 throw new InvalidOperationException("Precision must be between 1 and 38.");
             }
             if (attribute.Scale > attribute.Precision)
             {
                 throw new InvalidOperationException("Scale must be between 0 and the Precision value.");
             }
             configuration.HasPrecision(attribute.Precision, attribute.Scale);
         }

    }
}

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2、OnModelCreating新增属性

protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            modelBuilder.Conventions.Remove<PluralizingTableNameConvention>();//移除复数表名的契约
            modelBuilder.Conventions.Remove<IncludeMetadataConvention>();//防止黑幕交易 要不然每次都要访问
            modelBuilder.HasDefaultSchema("SCM");
            //base.OnModelCreating(modelBuilder);
            //注册函数
            modelBuilder.Conventions.Add(new FunctionsConvention("SCM", this.GetType()));
            modelBuilder.Conventions.Add(new DecimalPrecisionAttributeConvention());
}

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3、实体属性绑定

using System;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;

namespace Example.Models
{
    [Table("T_SCM_QUTV_DET")]
    public class T_SCM_QUTV_DET
    {
        [Key]
        public string ID { get; set; }

        [Display(Name = "父ID")]
        public string T_SCM_QUTV_PARENT { get; set; }

        [Display(Name = "行号")]
        public int T_SCM_QUTV_LINE { get; set; }

        [Display(Name = "单价")]
        [DecimalPrecision(19, 4)]
        public decimal T_SCM_QUTV_PRICE { get; set; }

        [Display(Name = "币种")]
        public string T_SCM_QUTV_CURR { get; set; }

        [Display(Name = "币种汇率")]
        [DecimalPrecision(19, 4)]
        public decimal T_SCM_QUTV_RATE { get; set; }

        [Display(Name = "关税税率(%)")]
        [DecimalPrecision(19, 4)]
        public decimal T_SCM_QUTV_COT_RATE { get; set; }


        [Display(Name = "税率(%)")]
        [DecimalPrecision(19,4)]
        public decimal T_SCM_QUTV_VAT { get; set; }

        [Display(Name = "本币币种")]
        public string T_SCM_QUTV_BASIC_CURR { get; set; }

        [Display(Name = "本币单价")]
        [DecimalPrecision(19, 4)]
        public decimal T_SCM_QUTV_BASIC_PRICE { get; set; }

        [Display(Name = "税后价格")]
        [DecimalPrecision(19, 4)]
        public decimal T_SCM_QUTV_END_PRICE { get; set; }

        [Display(Name = "备注")]
        public string T_SCM_QUTV_RMKS { get; set; }

        [Display(Name = "报价")]
        public bool T_SCM_QUTV_SUB { get; set; }

        [Display(Name = "报价人")]
        public string T_SCM_QUTV_SUB_BY { get; set; }

        [Display(Name = "报价时间")]
        public DateTime? T_SCM_QUTV_SUB_DATE { get; set; }

        [Display(Name = "选取状态")]
        public bool T_SCM_QUTV_SELETED { get; set; }

        [Display(Name = "选取人")]
        public string T_SCM_QUTV_SELETED_BY { get; set; }

        [Display(Name = "选取时间")]
        public DateTime? T_SCM_QUTV_SELETED_DATE { get; set; }

        [Display(Name = "附件")]
        public string T_SCM_QUTV_FILENAME { get; set; }

        [Display(Name = "电子路径")]
        public string T_SCM_QUTV_REALFILENAME { get; set; }

        [Display(Name = "录入人")]
        public string T_SCM_QUTV_CRT_BY { get; set; }

        [Display(Name = "录入时间")]
        public DateTime T_SCM_QUTV_CRT_DATE { get; set; }

        [Display(Name = "修改次数")]
        public int T_SCM_QUTV_MOD_TIMES { get; set; }

        [Display(Name = "修改人")]
        public string T_SCM_QUTV_MOD_BY { get; set; }

        [Display(Name = "修改时间")]
        public DateTime T_SCM_QUTV_MOD_DATE { get; set; }

        public virtual T_SCM_QUT_VEND _qut_vend { get; set; }

    }
}

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