该类就用了几个类型，如int，int?，string，所以其它类型就先没管。
用到的类：
public class tb_Projects
{ public int ProID { get; set; }
public string ProjectName { get; set; }
/// <summary>
/// 编码
/// </summary>
public string ProjectCode { get; set; } public int ParentId { get; set; }
public int? NextId { get; set; }
public int? ProjectOrder { get; set; } public int IsEnabled { get; set; }
/// <summary>
/// 业主单位id
/// </summary>
public int? OwnerId { get; set; }
/// <summary>
/// 施工单位ID
/// </summary>
public int? ConstructionId { get; set; }
/// <summary>
/// 监理单位id
/// </summary>
public int? SupervisionId { get; set; }
/// <summary>
/// 承包单位id
/// </summary>
public int? ContractId { get; set; } /// <summary>
/// 第几级（即在树层次中第几级，根元素级次为1，以此类推）
/// </summary>
public int? Level { get; set; }
/// <summary>
/// 数量
/// </summary>
public int? Quantity { get; set; } public int VersionIng { get; set; } /// <summary>
/// 里程桩号
/// </summary>
public string MileageNo { get; set; }
/// <summary>
/// 标准编码
/// </summary>
public string ComponentCode { get; set; } /// <summary>
/// 内部编码
/// </summary>
public string NComponentCode { get; set; } /// <summary>
/// 流程状态
/// </summary>
public int TaskStatus { get; set; } public string FbxId { get; set; }
/// <summary>
/// 判断是否为单位工程
/// </summary>
public int IsSubunit { get; set; }
/// <summary>
/// 所属标段
/// </summary>
public string BiDSion { get; set; }
}
代码1：
StringBuilder sb = new StringBuilder();
Type elementType = typeof(Models.tb_Projects);
elementType.GetProperties().ToList().ForEach(propInfo =>
{
if (Nullable.GetUnderlyingType(propInfo.PropertyType) == null)
{
//普通类型
Type t = propInfo.PropertyType;
if (t == typeof(System.String))
{ sb.Append($"if(!string.IsNullOrWhiteSpace(item.{propInfo.Name})){{row[\"{propInfo.Name}\"]=item.{propInfo.Name};}}\r\n"); }
else
{ sb.Append($"row[\"{propInfo.Name}\"]=item.{propInfo.Name};\r\n"); }
}
else
{
//可为空类型
Type t = Nullable.GetUnderlyingType(propInfo.PropertyType);
if (t == typeof(System.String))
{ sb.Append($"if(!string.IsNullOrWhiteSpace(item.{propInfo.Name})){{row[\"{propInfo.Name}\"]=item.{propInfo.Name};}}\r\n"); }
else
{ sb.Append($"if(item.{propInfo.Name}!=null){{row[\"{propInfo.Name}\"]=item.{propInfo.Name};}}\r\n"); }
}
});
System.IO.File.WriteAllText("2.txt", sb.ToString());
Console.ReadLine();
代码2：
public DataTable GetDataTable(List<tb_Projects> list)
{
DataTable dt = new DataTable(TableName);
Type elementType = typeof(tb_Projects);
elementType.GetProperties().ToList().ForEach(propInfo => dt.Columns.Add(propInfo.Name, Nullable.GetUnderlyingType(propInfo.PropertyType) ?? propInfo.PropertyType)); list = list.OrderBy(c => c.ProID).ToList();
list.ForEach(item =>
{
DataRow row = dt.NewRow(); #region 生成赋值语句 //StringBuilder sb = new StringBuilder();
//Type elementType = typeof(Models.tb_Projects);
//elementType.GetProperties().ToList().ForEach(propInfo =>
//{
// if (Nullable.GetUnderlyingType(propInfo.PropertyType) == null)
// {
// //普通类型
// Type t = propInfo.PropertyType;
// if (t == typeof(System.String))
// { sb.Append($"if(!string.IsNullOrWhiteSpace(item.{propInfo.Name})){{row[\"{propInfo.Name}\"]=item.{propInfo.Name};}}\r\n"); }
// else
// { sb.Append($"row[\"{propInfo.Name}\"]=item.{propInfo.Name};\r\n"); }
// }
// else
// {
// //可为空类型
// Type t = Nullable.GetUnderlyingType(propInfo.PropertyType);
// if (t == typeof(System.String))
// { sb.Append($"if(!string.IsNullOrWhiteSpace(item.{propInfo.Name})){{row[\"{propInfo.Name}\"]=item.{propInfo.Name};}}\r\n"); }
// else
// { sb.Append($"if(item.{propInfo.Name}!=null){{row[\"{propInfo.Name}\"]=item.{propInfo.Name};}}\r\n"); }
// }
//});
//System.IO.File.WriteAllText("2.txt", sb.ToString());
//Console.ReadLine(); //row["ProID"] = item.ProID;
//row["ProjectName"] = item.ProjectName;
//row["ParentId"] = item.ParentId;
//row["Level"] = item.Level;
//row["BiDSion"] = item.BiDSion;
//row["VersionIng"] = item.VersionIng;
//row["MileageNo"] = item.MileageNo;
//row["ProjectOrder"] = item.ProjectOrder;
//row["ProjectCode"] = item.ProjectCode;
//row["NComponentCode"] = item.NComponentCode;
//row["NEXTID"] = 0;
//row["ISENABLED"] = 0; #endregion //默认值 赋空
elementType.GetProperties().ToList().ForEach(propInfo => row[propInfo.Name] = DBNull.Value); //不为空 赋值
row["ProID"] = item.ProID;
if (!string.IsNullOrWhiteSpace(item.ProjectName)) { row["ProjectName"] = item.ProjectName; }
if (!string.IsNullOrWhiteSpace(item.ProjectCode)) { row["ProjectCode"] = item.ProjectCode; }
row["ParentId"] = item.ParentId;
if (item.NextId != null) { row["NextId"] = item.NextId; }
if (item.ProjectOrder != null) { row["ProjectOrder"] = item.ProjectOrder; }
row["IsEnabled"] = item.IsEnabled;
if (item.OwnerId != null) { row["OwnerId"] = item.OwnerId; }
if (item.ConstructionId != null) { row["ConstructionId"] = item.ConstructionId; }
if (item.SupervisionId != null) { row["SupervisionId"] = item.SupervisionId; }
if (item.ContractId != null) { row["ContractId"] = item.ContractId; }
if (item.Level != null) { row["Level"] = item.Level; }
if (item.Quantity != null) { row["Quantity"] = item.Quantity; }
row["VersionIng"] = item.VersionIng;
if (!string.IsNullOrWhiteSpace(item.MileageNo)) { row["MileageNo"] = item.MileageNo; }
if (!string.IsNullOrWhiteSpace(item.ComponentCode)) { row["ComponentCode"] = item.ComponentCode; }
if (!string.IsNullOrWhiteSpace(item.NComponentCode)) { row["NComponentCode"] = item.NComponentCode; }
row["TaskStatus"] = item.TaskStatus;
if (!string.IsNullOrWhiteSpace(item.FbxId)) { row["FbxId"] = item.FbxId; }
row["IsSubunit"] = item.IsSubunit;
if (!string.IsNullOrWhiteSpace(item.BiDSion)) { row["BiDSion"] = item.BiDSion; } //初值 仅这里使用
row["NextId"] = ;
row["IsEnabled"] = ; dt.Rows.Add(row);
}); return dt;
}