Question

I m 开发一个WCF网络服务,我使用ADO。查阅数据库的实体净额。

我使用这种方法将一些数据库物体转换成合同物体:

public static List<BlockContract> FormBlocks(int formId)
{
    List<BlockContract> blocksList = null;

    using (var vAdmEntities = new ADMDatabase.ADMEntities())
    {
        var blockEntities = from f in vAdmEntities.Form
                        where f.formId == formId
                        select f.Block;
        if (blockEntities != null)
        {
            blocksList = new List<BlockContract>(blockEntities.Count());
            foreach (ADMDatabase.Block b in blockEntities)
            {
                BlockContract blockContract = new BlockContract
                {
                    blockId = b.blockId,
                    name = b.name,
                    orderInForm = b.orderInForm
                };
                blocksList.Add(blockContract);
            }
        }
    }

    return blocksList;
}

页: 1 栏目:

Cannot convert type  System.Data.Objects.DataClasses.EntityCollection<ADMDatabase.Block>  to  ADMDatabase.Block

我如何解决这一错误?

Answer 1

你们需要改变 lo;

foreach (var blockItems in blockEntities){
     foreach (ADMDatabase.Block b in blockItems)
            {
                BlockContract blockContract = new BlockContract
                {
                    blockId = b.blockId,
                    name = b.name,
                    orderInForm = b.orderInForm
                };
                blocksList.Add(blockContract);
            }
}

你们选择了以下选区:

var blockEntities = from f in vAdmEntities.Form
                        where f.formId == formId
                        select f.Block;

页: 1 你们的实体将像形式以来的清单一样。栏目是块块清单。

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